Or you can be replaced on the field by another player while you wait for the blurry vision to go away. I have always wondered what football would be like if you

Or you can be replaced on the field by another player while you wait for the blurry vision to go away. I have always wondered what football would be like if you changed just one thing: Limit substitutions to one per half like Soccer and thus, obviously, force all players to play offence, defence, and special team plays.