Block/Player Control Ruling in High School BBall

[Afrosheen]

Here's the case that I need help determining the ruling on. Any consideration is much appreciated:

A1 is driving towards the basket with the ball. B1 gains legal guarding position in front of A1 before A1 goes airborne. A1 goes airborne then adjusts his body so that his head and shoulders go past B1's torso and then there's a crash at the hips of both players causing them to fall. What is the call (no call is not an option)?