Quote Originally Posted by Adventureless_Hero View Post
Relistening, did anyone notice that right after Michael takes his shots at Randy and Steven catches up with him, he says, "A few of them were burned! Did you see that?"

I think this could be a subtle clue as to where they zombies came from. Possibly they were burned from however Michael escaped the Water Pumping Station? Maybe?
Maybe, but I thought it was more about how the zombies escaped the burning arena, and they are now on the loose. (Michael doesn't know that the Arena's been burned down.)