Finnick has Schrodinger's intelligence. It's impossible to know for sure what's going on behind those blue eyes.

He scoffs a small laugh, too, then says thoughtfully, "I don't think I've used that one on anyone yet, so you're the guinea pig. Some people do like touching the gills, though. Not sure what that's about." Gills aren't sexy, they're only hot because they're on his hot body, in his opinion.