Matching Pairs Flag Football RulesOnline version Quiz Rules: (PE.7.C.2.1) by Todd Gicker 1 Fumble 2 Interception 3 Downs 4 Line of Scrimmage 5 Sack When the defensive player catches a pass intended for an offensive receiver The imaginary line where the nose of the ball is placed to separate the offensive team from the defensive team. When the Quarterback has his flag pulled by the defense behind the line of scrimmage When the ball is dropped after being in possession The offensive team has 4 to advance the ball to the next 1st down marker. Teams may advance the ball by passing or rushing.