would have said, "Pretty apparent that he led with his head and made contact with the players helmet", but no flag so all they said is what a great hit it was.
Incidentally I think it is pretty easy for viewers to make commentary--but the game is really fast and I think players can leave their feet intending one thing, but it changing based on what the other player does. I see that it is very necessary given what we are learning about concussions and head trauma, but really difficult to enforce.