This is borderline illegal here because he starts at the "behind the ear" area that is fair game and ends up coming around the back of the head slightly but from the side profile he stays on the side at least with his body, Bonnar was already trying to duck it as it was coming around which actually gives Bonnar more credit that I was willing to give him after seeing the fight the first time.

My exact reason for my feelings on Joe Silva though, right here.