Tell us about the main character in your WIP, recent release, or the main character in the book you’re reading.

What’s your favorite thing about that character?

In one short paragraph:

• Showcase their personality.
• Showcase their flaws.
• Showcase their inner struggles.
• Showcase something special about them.

Bloodstain Pattern Analysis is the forensic interpretation of human blood evidence in crime scene investigations. It’s used to recreate actions that caused the bloodshed. Because blood has chemical properties that behave according to specific laws, trained analysts can examine the size, shape, and distribution of bloodstains to draw conclusions of what did—or did not—happen.

Bloodstain Pattern Analysis (BPA) applies the sciences of anatomy, biology, chemistry, mathematics, and physics to answer questions like:

• Where’d the blood come from?
• Who’d it belong to?
• How’d it get there?
• What caused the wound(s)?
• From what direction was the victim assailed?
• How were the victim and perpetrator positioned?
• How many victims and perpetrators were there?
• What movements were made after the bloodshed?

You’ve seen the CSI shows where investigators, dressed in their ‘bunny suits’, photograph drops, streaks, smears, and pools of blood, then swab for DNA and String the room back to Area of Convergence points. Well, that’s pretty much how it happens, except today most Stringing is done by 3D computerization.

Bloodstain pattern interpretation is nothing new. It’s been around two hundred years and became increasing sophisticated as technology advanced. I’ve been involved in a number of BPA examinations during my time as a cop and coroner. One that really stands out was when Billy Ray Shaughnessey axe-murdered his ex-girlfriend and her new lover. The room looked like a bomb went off in a red paint factory. I’ll tell you more about it at the end of this article. First, let’s look at how blood behaves.

Blood has three components that are suspended in plasma.

Erythrocytes are your red cells that transfer oxygen through hemoglobin. It’s what gives blood the red color. Leukocytes, your white cells, are your body’s defenders and support your immune system in fighting infection and disease. Platelets are formed in your bone marrow and play a major role in hemostasis or plugging up breaches in vessels.

Blood composition is about 55% plasma and 45% formed elements, or cells, which remain suspended due to agitation caused by your circulatory system. That’s called viscosity—it’s density or internal friction. Once blood leaves your body’s pressurized containment, it’s subject to the forces of gravity and surface tension which dictates its resting shape. That can be in drops, streaks, or pools.

Crime scene bloodstains take different forms due to factors like velocity and distance of travel, amount of blood flow, angle of impact, and type of surface or target it lands on. There are eight categories of bloodstain patterns:

Single Drop — These stains are typically from a vertical fall and under low velocity, like when your cut your finger and blood drips to the floor. Blood molecules are very cohesive. They attract and bind in a surface tension that makes a sphere. The drop stays in a ball until it strikes an object or a force acts on it. This is called bleed-out.

Impact Spatter – These result from forceful impacts between an object and wet blood, causing the blood to break into little droplets. Greater force produces smaller droplets. The study of impact staining provides huge insight into the relative positions of individuals and objects involved in the crime. There are three sub-categories of impacts:

1. Low Velocity Impact Spatter (LVIS) — Also called Passive Impact Spatters, these are the largest bloodstain drops with a diameter of 4mm or greater. They travel at a slow speed, no greater than 1.5 m/s. They’re associated with being struck by a large, blunt instrument such as a chair or leaking from an open wound. They’re also formed when a large amount of blood has been transferred to another surface and the excess drips down.

2. Medium Velocity Impact Spatter (MVIS) — These spatters are associated with an intense beating like from a club, a hammer, a gun butt, or a bag of frozen pork chops. (Yes, I once had a homicide case where a guy’s head was caved-in with a bag of frozen pork chops.) MVIS drops are less than 4mm and get propelled at speeds between 1.5 and 7.5 m/s. The further from the target surface that blood is expelled, the larger the drops will be.

3. High Velocity Impact Spatter (HVIS) — This stain pattern is caused by gunshots, explosions, or contact with high-speed objects like having your throat cut with an electric carving knife. (Had one of those, too.) They’re evident by masses of tiny droplets less than 2mm in diameter and occur at velocities far in excess of 7.5 m/s. There’s no mistaking this type of bloodstain. The angle of impact is evident by an elongated shape – the longer the stain, the longer the angle from vertical.

Cast-Off Stains — COS are common in scenes such as Billy Ray Shaughnessy’s axe-murders where straight and curved lines of blood are made on the walls and ceiling by the centrifugal force of back-and-forth swings. They produce tear-shaped or oblong stains with ‘tails’ that point in the direction of travel. By reversing the line of travel, the path can be traced or stringed to its area of convergence.

Transfer Bloodstains — These are generally patches and smears of blood deposited secondary to the main, violent event. They say a lot about sequence. It can be when a victim tried to crawl away, the body was dragged, the perpetrator placed a bloody hand on a wall, or when he hid the axe in a closet like Billy Ray did. Tell you more about him soon.

Projected Pattern — This is from arterial damage, such as severed carotids, femorals, radials, and brachials where pressurized blood ejaculates via the still-beating heart. You’ll see groups of big to small splotches, usually in an arc pattern. Very common in stabbings.

Pooling — Usually occurs once the victim is unconscious and passively exsanguinates. That’s the fancy term for bleeding to death. Something telling to a Bloodstain Pattern Analyst is where large pools of blood occur in different locations—no doubt the body’s been moved.

Insect Stains — Not long after death, the bugs show up. They land in the bloodstains and make little tracks all over the place. These are easily confused with HVIS to the untrained eye and known in the industry as Flyspeck.

Expiration Stains — These are incidental bloodstains associated with injuries to the respiratory and abdominal tracts where a gasping victim expels through the mouth or nose. They appear diluted, more brownish in color due to mixture with saliva or mucous, and look like a fine mist.

Examination of a bloody crime scene is a slow and methodical procedure.

The area is still photographed from wide, medium, and close-up angles as well as videoed. Each stain pattern is marked, catalogued, and a swab taken for serology or DNA typing. The patterns are then Strung to their Point Of Origin, or area of convergence, and a complex application of trigonometry begins to tell a compelling tale of just what went down.

The visual absence of blood can be misleading.

Criminals occasionally clean up a scene or there may be only a small bit of blood emitted. Chemical reactive agents like luminol and phenolphthalein can be applied which visualize latent stains. Light spectrum tools, such as LumiLights, are also used to amplify spots not visible to the naked eye.

Getting back to Billy Ray Shaughnessey — This guy hid in his ex’s attic with an axe for two and a half days, waiting to catch her with a new beau. Sure enough, she brought one home from the bar. At 3:00 am, Billy Ray crept down from the hatch, snuck into the bedroom, and chopped them to pieces. Like I said, the crime scene looked like a bomb exploded in a red paint factory.

It took us three days to catch Billy Ray. He did the right thing and fessed-up, then re-enacted the murders on video. It was the coldest thing I’ve seen. Billy Ray described what he did as if he were watching Jason or The Shining, going through repeated motions of chopping, and back-swinging, and chopping some more. He demonstrated with a 2×2 stick as a prop. (We were nervous about giving him a real axe.) He showed how he modified body positions after death, where he hid his axe in the closet, and where he cleaned himself up.

Billy Ray did the right thing again. He pleaded guilty, receiving two life sentences.

During the three days we hunted for Billy Ray, the Forensic Identification team sealed the crime scene and independently conducted their Bloodstain Pattern Analysis. Once Billy Ray was done, we (the detective team) compared notes with the forensic team and — unbeknownst to what Billy Ray reenacted — the forensic folks got it bang-on. They’d reconstructed how many blows each victim received, various positions everyone was in, and… who fought back. I was sold on the science ever since.

Here are links to more information on Forensic Bloodstain Pattern Analysis:

A Simplified Guide To Bloodstain Pattern Analysis

The Forensics Library – Bloodstain Pattern Analysis

Principles Of Bloodstain Pattern Analysis – Theory and Practice

Bloodstain Pattern Analysis – Crime Scene Reconstruction

Kill Zoners – Have you used bloodstain pattern analysis in your works? Have you researched this science arm? Wide, wide open to comments.

By John Gilstrap

On November 1, 2010, I was a reluctant founder of a critique group that was designed to help a group of professional writers better. Everyone lived in Northern Virginia, so we could meet in person, and since I had the biggest basement (and a Big Boy Job at the time, which put constraints on my ability to come home and head out again) we agreed to meet at my house. In my rumpus room, as it were. Thus was born the Rumpus Writers, aka Rumpi.

Since then, Donna Andrews, Art Taylor, Ellen Crosby, Alan Orloff, and I have met every month, with 100% attendance by everyone. That’s 138 meetings. The madness of the pandemic drove us to Zoom, but the record remains. Among the five of us, we have published (or have under contract) 92 books, 53 of which came out since we started getting together. In addition, we’ve written and published 109 short stories and edited 12 anthologies.

Collectively, we have been nominated for 55 major industry awards, of which we have one 36. Awards and nominations include: Edgar, Derringer, Agatha, Lefty, Toby Bromberg, Anthony, Barry, Library of Virginia People’s Choice, Romantic Times Readers Choice, Dilys, Macavity, Thriller, Shamus, Alex, Mary Higgins Clark and (believe it or not) the Gourmand World Cookbook Award.

Full disclosure: I was resistant to joining this group back in 2010 for several reasons. First, I am loathe to share unfinished writing with anyone. I didn’t understand the point of wasting other people’s time reading something that I already know is not up to snuff. Second, groups consisting of busy people tend to fall apart quickly. People don’t take their commitments seriously and I feared that the group would devolve into a massive time suck.

I didn’t really know any of these other authors until our first meeting. I had crossed paths a couple of times with Donna Andrews, and had chatted a couple of times with Ellen Crosby, but that was the extent of it. I made my concerns clear on our very first meeting. Not only were they well received, they were shared by everyone. That’s when we made the commitment that we would never miss a meeting. We’d figure out a way to get together once per month, come hell or high water. So seriously have we taken this commitment that there’ve been a few times when no common dates were available in a given month, so we’ve doubled up the meetings on the previous or subsequent month. There’s never been a twelve-month period when we haven’t met 12 times.

Format

The meeting starts at 7 pm. Read: 18:59:60. Every meeting starts with news of both the personal and business variety. The news is sprinkled with a hefty serving of gossip, too, but there’s an ironclad rule that nothing said leaves the room. Given recent circumstances in the news, we are officially more secure and honorable than Supreme Court clerks.

The chatting lasts for about an hour, and then it’s time to get to the business of critiquing. In turn, we read aloud from that week’s submission. Then, there’s a round-robin of input and we move on to the next submission. It’s rare that everyone has something to read on any given night, but it happens from time to time. Most submissions are in the range of 12-15 pages, but they’ve gone as high as 30+ pages. I think I am the record holder on a complete short story, but I needed to know if the payoff actually paid off.

Rules of Engagement

This one’s pretty easy. We’re honest without being snarky. One of my most frequent comments is, “Nothing happened in that scene.” It’s easy to do. You get caught up in exposition or dialogue and action gets lost. A comment I hear about my own work more often than I’d like is, “That emotion felt unearned.”

Then there’s the occasional knife to the heart: “That whole thing just didn’t work for me.”

Occasionally, there’s disagreement between us when offering a critique of a member’s work and we talk through it.

The target of the critique remains silent, taking it in until the end, when it’s fine to seek further input.

Pre-Validation Means A Lot

I think a large part of the group’s success is driven by the fact that none of us has anything to prove. We’re successful as authors, we’ve got established audiences, and we don’t seek abject approval (though it is always welcome). After all of this time, we have grown accustomed to each other’s voices on the page, and every one of us routinely violates the rules that we’ve heard in conferences and such are inviolable. Most of the time, those violations work for the story, or are a part of the author’s style.

What pre-validation does in a group like this is eliminate the need for forced praise before getting down to the business of what doesn’t work. We all know and respect that we’re capable writers. As such, we are also able to choose for ourselves which bits of advice we’re going to take, and which we’re going to ignore. When the meetings end, nobody feels bruised, and the friendships remain intact.

What Does This Mean For Writers Seeking Critique?

Over the years, I’ve sat in on critique sessions among amateur authors, and they all make me squirm. Attendees often are far more interested in hearing how brilliant they are than how to make things better. On the opposite end of the spectrum, there are the writers who are convinced they suck and therefore never process the good stuff they hear. Then there are the competing egos and genres, where the MFA graduate insists that the mystery or romance that someone else has written isn’t literary enough, or the genre writer who thinks a literary piece doesn’t work.

All too often, feelings get thrashed and no one has a good time.

I tell people who are looking for honest critique that almost all external input is harmful unless you have a strong sense of yourself as a writer. You need to find an honest neutral gear in your creative self where you are able to absorb the compliments and the criticisms with equal cynicism. Accept if only for the sake of argument that the other parties are coming from an honest place, but don’t assume that the reader who liked the piece is more accurate in his assessment that the one who did not.

As I’ve written in this blog before, the fact that the person with the critique bears the title of teacher does not imply infallibility. Sometimes, in the grand scheme of things, they can be flat-out wrong. On the other hand, they could be brilliant. How are you to tell the difference? I have no idea.

Now to you, TKZ family. Have you belonged to a critique group? How did it work out for you?

A few months ago, I bought a walk-behind DR brush cutter to clear several overgrown acres in the back half of our new weekend property in Lamar County, Texas. In our part of the world we usually use tractors with bush hogs dragging behind, but I didn’t want to lay out the capital for such a big rig, hence the DR.

This thing is a beast that chews up saplings three inches in diameter without even struggling to clear its throat. Chest-high Johnson grass and weeds? No problem. It shreds that kind of vegetation with satisfying, crunching sounds reminiscent of a sharp knife cutting through limp celery.

The front stretches out like the hood of a ’76 Ford Thunderbird and the monster cutter is driven by an engine big enough to power that same car. The belt drive will yank it from your hands in third gear, so the only thing one has to do is engage the blade thick as a Roman broadsword and follow…sometimes reluctantly when the terrain forces a veer off the operator’s intended path.

One such unplanned shift in direction took me through a thick patch of head-high thorny blackberry vines and oak saplings, resulting in long, bloody scratches down my arms. However, when I looked back, the new lane was clear as a walking path in a city park.

Hang on, Ethyl, I think this boy’s gonna start reminiscing!

The whole thing reminded me of a scene that locked into my mind about twenty years ago when the legendary Y.O. Ranch in South Texas hosted a weekend cattle drive for outdoor writers and one of their children. Our youngest daughter who was thirteen at the time, nickname Taz, is a natural on horses and she was excited to go.

It was a real three-day cattle drive across that huge 40,000-acre ranch, moving a hundred or more longhorns from one pasture to another. On the first day, cowboys taught the city slickers how to ride, and later that evening kids learned to cook over an open campfire. It was a breeze for Taz, who grew up camping with us and already knew how to ride.

We pushed the herd on the second morning under a gray, leaden sky weeping with rain. The herd’s trail boss made it clear that if “things got western,” kids and dads were to get the hell out of the way and let the real cowboys handle the herd.

Ten experienced cowhands circled the cattle and pushed them into a long string through the first pasture full of prairie savanna grasses, cedars, and ragged mesquite. Mounted kids and dads filled in the loose circle of riders, walking their horses in pace with the longhorns and cowboys who looked to be straight out of casting.

I was riding point with the trail boss and Taz was halfway back when something spooked the tough, rangy longhorns. The leaders instinctively wheeled and charged into a thicket of fifteen-foot-high mesquite trees lining a dry wash. The rest of the herd followed, ignoring the experienced cattlemen’s attempts to stop them.

In the Trail Boss’s terms, things got western.

He spurred his horse and took off to the right and around the end of that big patch of crooked trees, intending to cut the herd’s leaders off and turn them until the rest of the cowboys punched through the dense foliage to help. Reins in one hand and a 35mm camera in the other, I followed right behind him and watched that man sit his horse like he’d been born in a saddle. Not nearly as graceful in the saddle, I held my own and we beat the herd coming through the brush and reined up in a small clearing to experience a scene straight from the 1880s.

The running cattle sounded as if a steamfoller was crashing through the thicket. Branches and limbs popped and crackled, hooves thundered on the ground, and whoops reached our ears both from kids and cowboys.

Then here they came. The leaders exploded through the thicket in a blast of dust and flying leaves with broken limbs and dead branches caught on their horns. The real cowboys popped out on both sides of the herd, doing their best to keep the cattle from scattering to the winds. My breath caught at the sight of a scratched and bloody kid bent low over the saddle horn to avoid the limbs, holding her hat with one hand, and riding like hell.

She passed us and flashed me a grin full of excitement and fun.

The trail boss roared and pointed. “Who the hell belongs to that kid?”

I raised a hand, expecting a good old fashioned dressing down in a cowboy way.

Instead, he built his own grin. “That little gal can ride with me any day!”

They passed, and I looked through a newly cleared lane stomped flat by hooves and huge bodies to see the rest of the kids and their fathers picking their way through the undergrowth.

Under a similar gray sky yesterday in Northeast Texas, I turned after unintentionally following the DR brush cutter through a ten-foot-high thicket of saplings and blackberry vines and the new lane looked similar to the one pounded flat by that runaway herd

So what does all this have to do with writing?

Creating your characters, building a scene, and then setting those fictional people on course is like starting that cattle drive. We’d planned to follow a two-track pasture road that day, an outline if you wish, but the thing turned on a dime.

I hadn’t planned on that lane the other day, just like Trail Boss hadn’t planned on his longhorns cutting a new path through the mesquites, but I was glad for the experience and such satisfying results, both times

My way of writing is to set everything into motion and then follow the plot as it turns when it wants, but those of you who outline may shriek and throw up your hands at veering off your course and abandoning your outline. Planners must push their characters say and do certain things at specific points in a manuscript, but wait a second.

Try this little exercise just once. Let your mind wander through five or six new pages, allowing your characters’ fictional personalities to find their way. They might turn around a sapling (read minor character), a mature oak (one of your major characters), or an unseen obstacle such as a dip or dry wash (clues or an unanticipated incident) and cut a different, open path that you can look back on with satisfaction.

What could a few bloody, mental scratches hurt in the long run?