To be fair part of the reason that Squall hadn't attempted harm on Zack's person was because he was sort of used to having to deal with annoying people. That and he didn't really want to bother with using any of his spells or summons to do it. He didn't really have a good way to the former back, and the latter were likely to cause more destruction then was worth the trouble.

Not that he was particularly interested in playing tour guide any longer than he had to, though. It was just that he'd grown used to having to deal with a wide variety of things on the scale of 'annoying' over the years. Besides, he still didn't really have anything better to do, so it wasn't like it was hurting anything. At least not yet, anyway.