Blocking Below the Waist
Offensive players who are outside the tackle box at the snap, and those who leave the tackle box after the snap, may only block an opponent below the waist if the force of the initial contact is directly at the opponent's front. However, they may not block an opponent below the waist in a direction toward the original position of the ball unless the ball carrier has clearly crossed the line of scrimmage.
Yeah stoopid....know the rules. This is obvious Roughing the QB.