Initially I thought it was a punch (posted as much) but on replays, it looked more like slaps at the helmet. The head butt came immediately after the two slaps/punches. OK, got it. There's no way you can go to the head like that, in any case. Plus, the hit out of bounds was just so over-the-top ridiculous. I know they got Staley for the follow-up and the call was bungled by the refs, but that was some incredible thuggery by Matthews on both sides of the play.