Okay, I was in Neptune's Bounty when this happened. As it appears, it is very hard to keep a Nitro Spilcer on fire, I, however kept hitting one of them with the plasmid and kill him on fire. When his health was down to death, he lifted his box above his head and the box exploded. When the smoke cleared, he was gone, but his cap and box was left behind, and his shadow (ash from explosion point) remained. I looked around the room, and I saw blood spattered everywhere, on the wall, celings, and floor. The Spilcer exploded himself.