Zombie Stumble - you have to kick them to make them stop. otherwise you just hurt them I do kick them. I hit them in the head with a pipe. Kick them when they stumble. Hit with pipe again, they just keep on a stumblin'. Ex: I was playing and this zombie was standing in front of me. As I crouch my way to unsespecting zombie, I hit him in the head with a pipe from behind. There is no movement from the zombie before hand and my pipe is swinging to the left. How in all that is physics does the zombie turn around stumble into me in a split second after being hit where the momentum is supposed to take it to the left, like other zombies (sometimes.) hahaha