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Flamethrower Backfire
A Sub-Trope of Man on Fire, for when the person carrying the flamethrower (and its fuel tank backpack) burns to death (or simply disappears in a fireball) when his/her pack is hit, or for when a bullet strikes a Molotov cocktail or incendiary grenade before the person carrying it has a chance to throw it. Would also count if the soldier manages to ditch the burning equipment before they themselves ignite (i.e. for a smoldering grenade attached to their web gear).

Not actually Truth in Television. While shooting or otherwise damaging the tank of a flamethrower will make it leak, the fuel won't ignite immediately (even a tracer bullet isn't guaranteed to so, since there's no oxygen inside the tank) unless something else ignites it. The fuel used by flamethrowers is also actually somewhat difficult to ignite and slow burning, which is what allows it to be fired in a targeted stream without igniting the backflow. Put simply, flamethrowers do not explode because this scenario occurred to the designers.

That is not to say, however, that the experience is likely to be pleasant for the operator or anyone standing nearby. For starters, anyone who has seen a ruptured aerosol can or air tank knows that it would be very bad to have one strapped to your back. As the punch from your metal backpack knocks you down, a caustic, slippery, noxious, and potentially flammable substance is now spraying at high pressure onto you, your comrades, and your surroundings. Given that one is holding an ignition source designed to ignite said substance, all it takes is a clench of the hand on the trigger to take things from bad to Nightmare Fuel. While not a recipe for an explosion, it is a great way to ruin someone's day.

Sister trope to Reliably Unreliable Guns. See also Hoist by His Own Petard. Compare Shoot The Fuel Tank, where the target is a vehicle but the results are similarly explosive. For other convenitent, if unrealistic, sources of Stuff Blowing Up, see Exploding Barrels, Every Car Is a Pinto, and the other SubTropes of Made of Explodium.

Contrast Video Game Flamethrowers Suck, as a Flamethrower Backfire in a video game is usually to the player's advantage: often, the player can make enemies' flamethrowers explode, but not vice versa. Also see Pineapple Surprise.


Examples

Anime and Manga
  • Black Lagoon: Revy takes out Claude "Torch" Weaver in the Greenback Jane arc by shooting his fuel pack, causing him to fly like a rocket before exploding.
    Revy: You're a rocket man, baby!

Comic Books
  • In the second Deadshot mini-series, Deadshot defeats Firebug by shooting the arsonist through the wings of his costume, which he uses to store the fuel for his flamethrowers. Firebug goes up in a fireball.
  • In "Welcome Back, Frank", The Punisher is well aware of the flamethrower's limitations: "Flamethrower's no good for a prolonged firefight. Sooner or later one of the tanks is going to take a bullet. Too bad for them that's what I'm counting on.

Film
  • The opening scene of Lethal Weapon 4 has Riggs do this to a flamethrower-toting bad guy.
  • Windtalkers does this to the squad member carrying the flamethrower.
  • Done in the opening scene of Saving Private Ryan.
  • Done in the Ultramarines movie - despite having no backpack tank the damaged space marine flamethrower explodes like a bomb.
  • In Red, an agent shoots a RPG at John Malkovich, and he shoots the RPG, which explodes mid-air and kills the agent.
  • In The Running Man, one of the Stalkers, appropriately named Fireball, dual wields flame throwers. It ends badly for him.
  • In True Lies, Harry improvises a flamethrower out of a fuel truck, but his nemesis shoots the fuel truck...with a rocket propelled grenade.
  • This is how the modern killer Santa's father died in Silent Night, being engulfed in flames after he and his homemade flamethrower were shot.

Literature
  • In the Doom novelisation, the Cyberdemon is defeated by smashing it into a wall so that its ammo pack full of rockets explodes.
  • In the Ciaphas Cain novel "For The Emperor" a sniper accompanying the main character shoots the pack of a (already dead) genestealer cultist's flamethrower to create a barrier to cover their escape (although this is justified, since the sniper was armed with a LongLas, which would easily have been able to boil the fuel and make the tank explode). Averted in the novel "Caves of Ice" where a flamethrower equipped guardsman is killed by a bolter to the chest.
  • In the Star Trek novel Strangers From The Sky, the terrorist Racher comes to a fiery end due to this after his laser-powered napalm-fed flamethrower jams in the arctic weather conditions it's being used in, causing the fuel to saturate his clothing and ignite when he charges with it.

Tabletop Games
  • In Warhammer, a skaven warpfire thrower has a good chance to explode violently on any malfunction.
  • Paranoia. A flamethrower could malfunction as a result of being hit in combat. If it did it would explode, causing massive damage to anyone within 5 meters, including the wearer.
  • Warhammer 40,000: Ork weapons are designed with no safety features in mind, so shooting the Ammunition Backpack is usually a good tactic.
    • Crossing this trope with Every Car Is a Pinto, the Hellhound Flame Tank can suffer a catastrophic explosion even to a mild hit as a result of its flamer tanks going up.
  • Ghost in the Shell The Roleplaying Game (d20). If a flamethrower's backpack is reduced to zero Hit Points it ruptures and explodes, causing fire damage to the wearer and splash damage to everyone within five feet.
  • Heavy Gear Equipment Catalog: Terranovan Equipment. If the fuel tank of a flamer (flamethrower) is hit it will have (undescribed) catastrophic results.
  • Battlelords of the 23rd Century. If a flamethrower's tank is punctured, it has a 20% chance of exploding.
  • Car Wars. A vehicle-mounted flamethrower could burst into flames and explode if hit by weapons fire.
  • GURPS Technomancer. If a flamethrower's backpack fuel tank is penetrated, it has a 1/6 chance (1/3 if it was a fire attack) to explode. The damage done depends on how many shots are left in the tank.
  • Dungeons & Dragons
    • Dragon magazine #67 article "Modern Monsters". A hit by a firearm on a flamethrower's fuel canister will cause an explosion doing 8d8 Hit Points of damage (with a saving throw for half damage) to all within 10 yards.
    • The Necklace of Fireballs is the magic equivalent of a bandolier of grenades. If both the wearer and necklace fail their saves against a magic fire attack, all remaining fireballs activate immediately.
  • Classic Traveller
    • The Dragon magazine #116 article "Aim and Burn" has several types of flamethrowers, each with their fuel supply in backpack tanks. On any penetrating hit from behind the tanks could explode, which would not only kill the user but cover a large area with burning fuel.
    • The Journal of the Travellers' Aid Society #3 article "Advanced Powered Battle Armor". The armor has a built-in flamer (flamethrower) with a fuel tank on the back of the suit. If the tank is hit there's an 8% chance the tank will explode, disabling the suit and killing the wearer.
  • d20 Modern: "A flamethrower’s backpack has hardness 5 and 5 hit points. ... A backpack reduced to 0 hit points ruptures and explodes, dealing 6d6 points of fire damage to the wearer (no save allowed)..."
  • Hollow Earth Expedition. A person wearing a flamethrower is a potential walking bomb if gunfire hits the flamethrower.

Video Games
  • Borderlands uses this trope in spirit; the elite Crimson Lance units all have ammo packs on their back and come in electric, acid, and fire varieties. You can shoot it until it explodes (although it'll take quite a bit of damage before blowing up) For Massive Damage.
  • Call of Duty: World At War: Nazis with flamethrowers explode when their tank is shot. In the Pacific, flamethrower Marines will explode in scripted events but the player is immune to this weakness.
  • Also done in the intro of Dawn of War, when the flamethrowers exploded when hit by an axe.
  • In Diablo 2 bosses with the Fire Enchanted modifier will explode violently upon death.
  • Gears of War: Flamethrower Locust mooks go up in flames after a few shots to their fuel tank. The Player Characters thankfully have no need for the thing.
  • Kill Zone: Liberation featured scout units (Helghast of course) with unusually explosive, large radios on their backs that stun the wearer when detonated. Thankfully, destroying the radio of a scout prevents them from calling in backup or alerting other Helghast.
  • In Mass Effect 2, flamethrower-wielding enemies will explode if hit with the correct power (Overload or Incinerate) or their fuel-tanks are shot. This can be used tactically by a player to inflict damage on other enemies.
  • Happens in Men Of War, usually by shooting a high enough caliber shot at the fuel tank carried by flamethrower troopers will cause the container to combust, and setting fire to everybody within several meters of them before finally burning to death themselves.
  • In The Punisher, this is how you defeat the Russian (he throws Exploding Barrels at you).
  • In Red Alert, Flamethrower explode when they died, even when it was with bullet.
  • In Saints Row: The Third, Flamethrower-armed Brutes can be killed the normal way, but since they wear a welding visor, they're mostly immune to headshots, making it much harder. On the other hand, if you can put enough bullets into the backpack of the flamethrower, it'll jet them into the air and explode.
  • Flamethrowers in the first Command & Conquer game would explode when shot, which contributed to their uselessness.
  • The first Syphon Filter game had the boss battle against Anton Girdeux. The man was wearing body armor that made him Immune to Bullets and Gabe can't use his explosive weapons without triggering the nearby bomb. However, Girdeux was also using a flamethrower and had a huge tank of fuel strapped to his back. Multiple well-aimed shots to his fuel tank later, and Girdeux was toast.
  • Oddly inverted in Alien Hominid. Troops with flamethrowers actually have huge healthpools and no sweetspot you can shoot to kill them faster, and while they do explode when they finally die odds are they were going to explode anyway.

Web Comic
  • In Gone with the Blastwave, Crosshair at one point suggests destroying a group of Yellows by having Pyro run into the middle of them and then shooting his fuel tank. Pyro replies that the blast radius wouldn't be big enough.
  • In Demon Fist, Jaws takes out Bon Bardman by biting holes in the gas hose of his flamethrower, extinguishing his pilot light at the same time. When he tries to use his lighter to restart it...

Western Animation


Flaming EmblemAction Adventure TropesFlynning
Fire/Water JuxtapositionThis Index Is On FireFlaming Emblem
Five Rounds RapidGuns and Gunplay TropesFreeze Ray
Fiery CoverupTropes That Go BOOM!Gas Leak Coverup
Fishing for SoleJust for PunFlying Under the Gaydar

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