Quote:
Originally Posted by Hockeyguy15
Also the zombies were never on the roof since they chained the door shut. He cut off his hand so he didn't die of exposure/dehydration on the roof.
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The zombies were going to get on the roof - there was a whole pack/herd of them in the stairwell banging against the door and it was only a matter of time until the chain holding them back gave. That's why he was so desperate to get away and cut his hand off - he'd have probably figured out a way to get out of the cuffs without chopping his hand off with more time, he was pretty resourceful.