"Oh!" Usopp's face lit up at Luffy's explanation. He still didn't really know this Brock guy, but he must be a decent person if he helped Luffy get his hat back. Although... Luffy said he had to do something bad to get his hat back, didn't he? Well, maybe Brock helped him through it--it was obvious Luffy thought the guy was okay, at least. Usopp glanced back at Sai's comment, realizing he was the only person who hadn't met the man sometime before.

Since Luffy had turned away from Brock to address his companion, Usopp found himself looking at the man awkwardly. "So... uh, you want a Tylenol?"