The time commitment for their activities had always been unclear, given Zach didn't know how long the prank was going to take. So his time was relatively open, and finding out something like that - even if it weren't - generally opened up periods of time. In this instance, for drinking. That had the possibility of being much more pleasant than talking, though either way Zach was fairly certain Blaise was going to feel like shite.
Leading the way, Zach wasn't sure what proper small talk was for the situation. It wasn't like Theo had gotten warning about his father's death. It had just happened. At least the walk was going to be quick. "Do you have a preferred brand of whiskey?" Zach settled on. He had quite a few kinds, so it was possible to even take that into account for the drinking.