American Football Rules IFAF Approved Ruling 8-5-1:VII

VII. A36 intends to punt from behind his goal line, but he muffs the ball. After A36 recovers the ball, he runs into the pylon at the intersection of the sideline and goal line. RULING: Safety,
unless the entire ball is beyond the goal line as the ball carrier contacts the sideline or pylon. The ball is dead at its most forward point when A36 contacts the pylon or sideline (Rules 2-31-3 and 4-2-4-d). [Cited by 2-31-3-c, 4-2-4-d, 8-5-1-a]