Hawk dive bombed by small bird repeatedly.

Video is of a hawk here in Harnett County Linden, North Carolina , sitting on overhead cable utility wire. The Hawk appears to be sitting with his wings ajar while he is repeatedly dive-bombed by smaller bird. My wife and I sound pretty funny narrating the action live, wow we (when I say we I really mean "me" ) sound absolutely ridiculous but that's me, what can I do. lol