Please explain to me how New England could challenge the "12 men on the field" when no call had been made by the officials. I re-watched and saw no flags. Does this mean any time a coach sees a hold or facemask they can just throw a challenge flag?? Am I missing some obscure rule or something? I could of sworn that a penalty had to be called for something to be challenged, but maybe rules are different for THE BEST TEAM EVER TO PLAY THE GAME. ever.