Consider this,
4th Quarter :03 left in the game. 3/10 @ 50. Game is tied. A8 gets the snap and drops back to pass. At the line of scrimmage A68 looses his helmet, on his own, and takes off running into the backfield to block. A8 gets hit and fumbles. B78 picks up the ball and starts running toward the EZ. A68 catches up with him and makes the tackle at the A-3. Result?