Warcry, speaking of a regenerator..... have you ever played Resident Evil 4? There is also a regenerator in it, and they don't die either. They make the worst sucking sound before you even see them, it's makes your blood run cold. If you shoot them in the legs they fall over, but then they do fucking crazy lurches, jumping through the air at you. The first time you don't expect it and it gave me a fright. Best way to kill them is to pump a shotgun into their head until they die