So yeah, I just killed this huge guy over here. How, you ask? By chopping him in half with my BFS! Surely, No One Could Survive That! But wait, what? What do you mean, part of him is getting back up?! What the hell does it take to stop this guy?! This trope is basically when a sentient being is able to function without their entire body in one piece. The portion of the being that's still functioning is often quite frightening to look at. In most cases it takes a hit to the brain to actually stop it, but there have been cases where even that doesn't work.