I had no idea what to call....

[Dad]

B1 is making a drive to the hoop. A1 is coming over to defend and it's blatantly obvious when contact occurs it's going to be a block. Before the block can occur B1 holds the ball out in front with two arms and runs it into A1. A1 continues to move forward and the force pushes B1 to the ground. B1 wildly throws the ball in an attempt to pass before falling and it goes right to A2. B1 takes a tumble. Note, the only contact was A1 running into the ball and not into B1.

Would anyone have a whistle here for anything, ever? I just thought, well that was interesting, and ran down to officiate the next play.