<Li> The quarterback quickly pulls the ball back from the hand off position, trying to hide it from the defense . He then looks downfield for an open receiver . </Li> <Li> The running back continues to move up field as if he has the ball in his hands . </Li> <Li> The offensive line comes off the ball to run block, but then goes into pass protection . </Li> <Li> The receivers "sell" the running play by appearing to block at first, then break off into their pass routes . </Li>

Where did the term play action come from