Can some one please tell me how a running back can be called for leading with the helmet. We have been called for it twice this year and each time Ive talked to the ref (cordially) after the game, and neither could tell me in a way that makes sense. Im not sure how the physics work when a running back holding the ball with two hand on contact and going to the ground cant have his helmet first. If he lowers his shoulder as every coach in America teaches his head comes with it. I understand on defense but this doesnt make a lick of sense to me, please let me in on this secret.