Zack is...as settled as he can be, given the circumstances. He's very uncomfortable with the fact that he was out cold during such a critical time, but there is nothing he can do to change that. His cabin is in order, he's talked to some people, his dog is okay, and that's - he keeps trying to tell himself that's what really matters.

(The fact that he wants to jump out of his skin because he keeps flashing back to four years spent in a basement lab, helpless to do anything, doesn't help -- but there's nothing he can do about that either.)

So he goes to meet Aerith like he promised and knocks on her door.