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Originally Posted by MJT
Blocking in the back – initial contact is in the opponents back, inside the shoulders, below the helmet, and above the waist, and against a player other than a runner or pretended runner.
BIB is permitted in the FBZ when
1) by offensive linemen who are on the LOS and in the zone at the snap
2) against defensive players who are in the zone at the snap
3) the contact is in the zone
4) the ball is still in the zone
Summary: Only offense can legally BIB. Offense must be on LOS and in zone at snap, defense just in zone at the snap. (LB’s are probably in the zone at the snap)
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Actually, the defense can BIB too. It's just listed under rule #9. A defensive player may block in the back to get to a runner or lose ball he may legally touch or possess.