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I don't read spoilers or the comic or read/watch any interviews, so it's coming solely from what I see in the show. It wasn't anything in the dialogue, it was more the way Bernthal played the role (more mouth breathing and shuffling/hunching than usual) and especially the way his scenes were shot, such as Shane looking sinisterly from the woods, framed by trees, the way a zombie would be depicted.
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Considering that one of the main themes of the show is how humans can be "monsters" when faced with a horrific situation, I took it as foreshadowing and a subtle reinforcement of that theme: his actions had made him as much a threat as any walker.