In the fourth chapter (A Question Of Faith) is a man and woman standing in the mist and talking about glyph energy and its amazing properties. When you find them, turn into Mist and stand behind the man without being seen. Make sure there is also a skull above his head. Wait until the woman is about to talk about how her workers are afraid of being around glyph energy. When she is about to say that, quickly use the one hit kill with your claws on the man. He will die and not fall over. You can also drain his blood as normal, and he still will not fall.