2-18 A fumble is usually but not always caused by an opponent’s contact (PlayPic A). A great majority of muffs occur on kick plays, such as when a player fails in attempt to catch the kick (PlayPic B).
2-18 A fumble (PlayPic A) is any loss of player possession other than by kick, pass or handing. A fumble may be recovered and advanced by any player of either team. A muff (PlayPic B) occurs when a player touches a loose ball in an unsuccessful attempt to gain possession.