>>718852463
Not 100% sure, been awhile, but I think it only gives you a "+1/+2 - Made him respect you" or something like that to his Empathy check, and that's it for stats/checks. As far as dialogue though, he talks less shit to you in various responses, at least compared to not hitting him, and especially compared to missing the punch, in which case he refers to you as his Pig or Cuno's pig and talks even more shit.