The rule for block in the back:
- Blocks an opponent (from behind) in the back above the opponent’s waist, or uses his hands or arms to push an opponent from behind in a manner that affects his movement, except in close-line play.
Note: The prohibition also applies to a player of the kicking team while the ball is in flight during a free kick or scrimmage kick.
The use of hands on the back is not a foul when:
- a player is making a personal attempt to recover a loose ball;
- the opponent turns away from the blocker when contact is imminent;
- both of the blocker’s hands are on the opponent’s side. (If either hand is on the back, it is a foul.)
Illegal block in the back is not a personal foul and is a 10 yard penalty. Any block from behind whether it is with the hands or shoulder is a penalty.
A blindside block is called when the blocker is moving towards or parallel with his own goal line and uses his head, shoulders of forearm to block a defender. I blindside block is not a penalty is the blocker just uses his hands to shove the defender out of the play. Blindside block is a personal foul and a 15 yard penalty.