[Zoochy]

Play: A1 begins a drive to the basket. B2 steps into A1's path, has two feet on the court while facing A1, and just before A1 reaches B2, B2 starts to fall backward. As B2 is falling backward but has not yet fallen all the way to the court, A1 dribbles through B2's torso, which knocks B2 the rest of the way to the court. Since B2 was not completely upright when the contact occurred, who shall be assessed with the foul?
NFHS, NCAAM and NCAAW rulings.