“Where does it stop?” Andy Reid was griping about the NFL’s new kickoff rule.

This year, for the first time, players can call for a fair catch on kickoffs short of the end zone, with the play considered a touchback and the ball coming out to the twenty-five-yard line. The rule is meant to reduce concussions on kickoff returns — the most hazardous play in the game, with players often colliding at top speed.