A short viral clip of a roofer unloading a nail gun at a suspected thief makes people laugh online.
But attorney and former prosecutor Tom Grieve looks at it very differently.
In his breakdown, Tom Grieve says the video is funny on one level, but legally it raises a serious question.
Was the roofer using deadly force when he fired that nail gun?
Grieve warns that if you don’t understand where the law draws the line between non-deadly force and deadly force, you could end up in prison.
The nail gun clip is just the hook he uses to explain a much bigger self-defense problem.
The Viral Nail Gun Clip And What’s Really At Stake
In the video Grieve describes, a roofer is up high working when someone tries to steal his air compressor.
The roofer spins, shoulders the nail gun, and starts firing nails in the direction of the suspected thief.
Grieve admits he “thought that was pretty funny” and is happy the worker didn’t lose the tool he uses to feed his family.
He also calls out the thief: shame on the “bad guy” for trying to steal.
But then Grieve takes the emotion out of it and focuses on the law.
He says he doesn’t really care whether that nail gun could actually puncture skin at that distance of maybe 40–50 feet.
What matters to him as a lawyer is how the law classifies that kind of force.
If the roofer’s actions are seen as deadly force, the legal standards are much higher than if it’s considered non-deadly.
That’s where most people get into trouble, Grieve says.
They think they’re just using “less-than-lethal” force, but the law might see it very differently.
How The Law Really Defines “Deadly Force”
Grieve explains that, legally, deadly force is not just force that kills someone.
It also includes force that can reasonably and foreseeably cause death or great bodily harm.
He says if you stab someone in the torso with a knife, no matter the exact injury, prosecutors will treat that as deadly force.
Same with shooting someone with a gun, whether it’s a .45 ACP, a .32 ACP, or a .22 rimfire.
To a prosecutor like the one Grieve used to be, any bullet going into a person is automatically deadly force.
You don’t get to argue that your caliber was “small” and therefore doesn’t count. Where people get confused, he says, is with weapons or tools that aren’t traditional firearms.
A nail gun, a bat, a car, even a hard kick to the head can end up in the deadly-force category if the injury risk crosses a certain line.
That line is “great bodily harm.” And Grieve spends most of his video explaining that piece.
What Counts As “Great Bodily Harm”?
According to Grieve, most states define great bodily harm (or “serious bodily injury”) in similar ways.
The exact wording changes, but the idea is the same.
He says great bodily harm usually means bodily injury that involves a substantial risk of death, protracted and obvious disfigurement, long-term loss or impairment of a body part, or prolonged loss of consciousness.
Some states also include long-term damage to an internal organ.
Grieve gives concrete examples.
Gunshot wounds and deep stabbings are obvious candidates, especially if they cause internal bleeding or organ damage.
Broken bones and compound fractures can count, depending on the state and how prosecutors and juries see it.
He points out that a shattered leg might mean you never ski, play hockey, or do your favorite activities the same way again.
He also mentions serious burns, large cuts that need extensive stitches or surgery, nerve or tendon damage, and the loss or amputation of a limb.
Traumatic brain injuries and long-lasting unconsciousness sit squarely in the great-bodily-harm camp too.
Grieve’s big point is that these definitions aren’t purely scientific. Different judges, prosecutors, and juries can see the same injury very differently.
That makes the legal ground even more dangerous if you’re the one who used force. You might think you caused only minor harm — the people judging you might disagree.
Why “Less-Than-Lethal” Can Still Be Legally Deadly
Grieve says he’s seen the same mistake over and over in his career as both a prosecutor and a defense attorney.
People think, “This isn’t a gun, so it’s not deadly force.”
They might throw something, stomp on someone, swing a heavy tool, or use some improvised weapon and tell themselves it’s non-lethal.
But if what they did could reasonably cause great bodily harm, then in the eyes of the law they used deadly force.
That’s where the nail gun clip becomes more than just entertainment.
If a nail could reasonably slam into an eye, chest, or neck from that distance, a prosecutor might argue that the roofer used deadly force over a piece of property.
Grieve doesn’t get hung up on the nail gun’s exact power.
Instead, he wants viewers to understand the legal framework: if your actions can reasonably cause great bodily harm, you are in deadly-force territory.
From a self-defense perspective, that matters a lot.
Deadly force is usually only justified when you are facing death or great bodily harm yourself, not when somebody is just stealing your stuff and running away.
That doesn’t mean the thief is “in the right.”
It just means the law often cares more about human life and serious injury than about protecting property.
Be A “Hockey Player,” Not A “Soccer Player,” In Court
Grieve also talks about how people sometimes try to stretch the definition of great bodily harm to justify a big reaction.
He shares a classroom example: someone throws “pocket sand” into your eyes.
A student once asked him if that kind of eye irritation is enough to justify pulling a gun because it might cause “protracted loss” of vision.
Grieve’s answer is basically: no, that’s not how this works. He jokes that you have to be a “hockey player, not a soccer player” about these definitions.
In other words, be tough, not dramatic.
A hockey player loses some teeth and “doesn’t miss a shift,” as Grieve puts it.
A soccer player gets lightly brushed and collapses, clutching their face like they’ve been shot.
Grieve warns that prosecutors and juries will expect more of the hockey mindset. If you exaggerate minor pain into “great bodily harm” to justify using extreme force, they may not buy it.
That doesn’t mean you have to just take abuse. But it does mean you should be realistic and honest with yourself about how bad a situation really is before you escalate to potentially deadly force.
Lessons From The Nail Gun Clip For Everyday Self-Defense
Grieve’s closing message is simple but serious.
If you don’t understand the difference between great bodily harm and lesser injuries, then you don’t really understand when you can legally use deadly force.
And if you don’t understand deadly force, he says, you’re walking straight toward “very ugly felonies.”
All it takes is one bad decision in a heated moment.
The nail gun roofer is lucky this ended as an internet joke instead of a criminal case.
If a nail had hit someone and caused permanent injury, that video might be Exhibit A in court. Grieve’s advice is to learn these definitions now, before you ever find yourself in a confrontation.
Know that many tools – not just guns – can cross the deadly-force line. From a commentary standpoint, his message is uncomfortable but necessary.
We all like seeing the “bad guy” get scared off, and it’s human to cheer when a thief runs empty-handed.
But the law doesn’t grade your actions based on internet likes.
It looks at risk, injuries, and whether your response was reasonable based on the threat you actually faced.
Grieve isn’t telling people to be helpless. He’s telling them to be smart – to defend themselves in ways that don’t accidentally turn them into the one facing prosecution.
As he reminds viewers, this is the kind of thing that separates people who go home after an incident from people who spend years fighting charges.
Understanding deadly vs non-deadly force may not be as “fun” as a viral clip, but it’s far more important.
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The article Viral Clip Shows Roofer Shooting Nail Gun at Suspected Thief – But Was It Deadly Force? first appeared on Survival World.
Mark grew up in the heart of Texas, where tornadoes and extreme weather were a part of life. His early experiences sparked a fascination with emergency preparedness and homesteading. A father of three, Mark is dedicated to teaching families how to be self-sufficient, with a focus on food storage, DIY projects, and energy independence. His writing empowers everyday people to take small steps toward greater self-reliance without feeling overwhelmed.
