Valerie didn't talk to Zero for a while, and he didn't try to force a conversation. In some ways, he knew it was his fault everything went to hell, so he planned to take responsibility.
Terry stayed out of Zero's way, and he wasn't sure if to feel bad about it or not. The pep talk he gave must have worked because people who dared to look him in the eye before scuttled off as soon as their eyes met his.
He didn't care about the bottom 500, he wanted to meet those who ran the place. The boss was never really present, and the top 1000 were in a different place entirely. At first, he worried.
But Alistair wanted to make his punishment absolute and Zero was not interested in Valerie enough to risk her life. Hence, he didn't go after her, not even to save himself.