You naturally bow up to protect yourself as a ball carrier. Just like a safety's body naturally follows whereever his head leads. They f'd up the last rule badly and i imagine this will be more of the same.
Bottom line, the NFL can't grow it's money much larger without more games to increase revenue. They are making a play on how this is safer for the game, but once they legislate violence from the game, they can make it a glorified NBA league and stretch out to 18-20 or 24 games so they can increase revenue. That's what this is all about. The fact that they are "concerned" about brain injuries is a front. Sad days ahead i'm afraid. Goodell has started the propaganda gravy train and Fischer, and everybody else is falling completely in line. The fans will be the ones losing.