Originally posted by BLizZOnE
OMG i saw this and it has happen to me.. Does anyone know why?

The zombie i was facing didn't want to die also... :hitman:
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NGU enjoy =D
Simple explanation, each round, zombies nearly triple the health they were first given, it was round 41, which means you need to put atleast two full guns of mp5k according to the damage it deals. there is a thread somewhere on the website, search it up.