Don't know if this is a bug, or if it is just my personal experience,
but when an oiler is on fire, or once i have killed an oiler, mainly on a vanaduke related level (depth) where the oiler just moved from it leaves an invisible trail of fire, which is invisible as i said, so i can't see it, and thus the result is me being on fire on a perfectly safe piece of floor.

I dont think the game was designed for oilers to leave invisible fire trails or the oil pits to be invisible since i dont know what the problem is, any clarification would be greatly appreciated.