Oz gave her a considering look. His expression didn't say very much, since he kept it in the same, thoughtful set it always had. He thought, however, that it was very unlikely she didn't know what the deal was with the instantaneous healing and the non-smelling. You don't go through life dealing with something like that and not try to figure out what was going on, and hence have a general idea about what the problem was. It was Oz's cautious opinion that whatever the real explanation was, she thought he wouldn't like it and so kept it from him. He had not quite absorbed the fact that he had 'been here before' completely enough to take it into account, but given enough time it would come to him, and he would need to find out what 'he' had done while 'he was here.' To Oz it sounded something like an alternate dimension, perhaps an alternate timeline. He'd thought through such possibilities quite a lot, and it was rather interesting to be presented with one in the flesh, so to speak.
The zombies, however, were a negative.
"I don't think that's a good idea," Oz said slowly, looking out over the dashboard at the zombie. His relative calm compared to George's alarm was like listening to a frenzied classical piece in front of a steady bass-line. Choosing his words with obvious care he continued, "I know I'm the new guy here, but I think that once they're a zombie, it's the usual drill with zombies. You know. Them being dead?"