Wait so Nick is suddenly afraid of Walkers now?
How's this make any sense? I mean he walked in a herd of them multiple times wearing their blood, he went out on a binge with Troy and strolled out around a ton of Walkers while he was high.
I don't really get what would suddenly make him scared of them after all the shit he's been through, what he was surrounded at some point after the Dam blew up and nearly died? He's been in that kind of situation before.