Now, everyone is protected by the helmet rule....if an OL uses his head in blocking a DL IT WILL BE A 15YD PENALTY!........interestingly we won't ever see the helmetless supermanlike plays anymore, but if you could knock the helmet off of a runner the play is whistled dead even if he isn't down! Also new this season, when a player loses his helmet, the play is immediately whistled dead. And now, during field-goal and extra-point attempts, the defense cannot position any player on the line directly across from the snapper, who's considered to be in a defenseless position. i.e Snapper Fake!