How in the hell do these things work? I was thinking about it fairly deeply yesterday. For one thing, when someone is attacked by a zombie, the zombie is very aggressive in their attack. To become a zombie in RE, you must AT LEAST not have your brain or nervous system compromised. I ask all of you, when you think of an RE zombie attack, where do you instantly think the zombies usually attack? The neck? That's where I see them attack most often. If it a frontal attack, then the spinal cord may remain undamaged. But a rear attack would be leaving the CNS (central nervous system) completely vulnerable. Therefore, it seems as if becoming a zombie may be harder in RE than Capcom would have us believe. Now, even if the transformation does occur, how does the zombie move? Energy must be burnt and oxygen must be carried to all of the vitals. So coagulation of the blood should not happen. Might this explain the signature bleed out that signifies the true death of a zombie (although transformation into a crimson may still happen in REmake)? I do not think that coagulation occurs in the RE zombie. How else would a crimson head occur? The crimson comes from the blood rushing to the head and the muscle tissue forming. Finally, what are the odds of every vital organ staying intact during a zombie attack? These organs would need to stay intact for a zombie to function at all. Just something to think about.