As they say, though, the right tool for the job.... Okay, okay. Let's look at this objectively, yeah? Can't kill them, they're already dead. Won't feel pain. But you can stop them chasing you... if the legs cannot support their weight, doesn't matter if they feel it or not, so take out the knees and ankles. As they fall, grab an arm and use an ogyaku shoulder lock to drive them face-down. Then we get the sharp pointy things. Okay?