on 4th down and 10, team A punts the ball. at the snap we have illegal motion, while the ball is in the air B35 makes an illegal block in the back. the ball is caught at his own 20 yard line and returned to the 40. the previous line of scrimmage was A's 35. are these offsetting penalties and replay the down? if there was no illegal motion we would have a psk foul.
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