the hit was not only legal, it was an awesome defensive tackle/hit, he led with his shoulder as I saw it. it did not deserve a flag and this "defenseless player" bs just shows how soft the league has become. I understand protecting players but if you want to do that, be consistent with the calls/non calls.
you want a dirty hit on a defenseless player, this right here is an example of it and # 53 is a scumbag for doing it.
is this incidental contact or using the helmet to knock the opponent out?
you make the call.