Was watching a college bowl game and saw this:
Team A punts and Team A catches the punt at the B 5 yard line. He continues into the End zone. Crew gave the Team B the ball at the 5 yard line. I did not think the momentum rule was given to Team A. Since he carried the ball into the end zone, we have a touchback. That is why the BJ and other in 7 man are at the goal line, to make sure the ball does not cross the goal line. It doesn't matter where the player is, just the ball. Once it crosses, it's a touch back. Doesn't matter if team B already touched it. It's not dead once he catches it, is it?