American Football Rules IFAF Approved Ruling 9-4-1:VIII

VIII. Team A’s backward pass in flight is batted by B1, and the ball goes out of bounds behind Team A’s goal line. RULING: Safety. A pass may be batted in any direction and the impetus is charged to Team A’s pass (Rule 8-5-1-a). [Cited by 8-5-1-a, 9-4-1-c]