Practically my whole team tried to kill this guy. His health wasn't going down with the amount of melees and shotgun blasts.
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THis would be called lag. The player in question has lagged to the point where he is acting ~1 min in the past, and it shows. (It's happened to me once or twice- you can't shoot anyone and no one really exists). None of you are hitting him, because TECHNICALLY, he was there a minute or so ago.