American Football IFAF Approved Ruling 9-1-16:IV

IV. B1 runs into player A1, who has kicked the ball and has had a reasonable time to regain his balance. RULING: Not a foul by B1 unless ruled as running into or throwing himself against an opponent obviously out of the play (Rule 9-1-12). [Cited by 9-1-16-a-4-a]