It's simple, Tyrese wasn't cut out for this world anymore. As they said on the talking dead after, when they were at the prison he said he couldn't kill the walkers on the fence and then they go out into the world and he says he can't kill out there either. He couldn't kill the termite when Judith's life was in danger, and clearly that ate at him since that guy was in his hallucination.
Fun fact, the guy doing the radio broadcast was Andy Lincoln.
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