Do you dispute that? Would Sorensen have made contact with the ball carrier’s head if he had attempted to run into the endzone? No. If the goal is to reduce head collisions then make leading with the helmet illegal on both sides.

Incidental stiff arm to the face mask will not be called but an offensive player targeting the opponents face mask or grabbing the face mask will get a flag. Plenty of examples this season.

There is no defensive disadvantage lost by the defender not being able to stiff arm the ball carrier to the face mask.

Defensive holding is a penalty. Offensive players can also ‘hold’ or grab in legal ways.