A1 is driving the lane. Going to the rim, B1 is standing in front of A1. A1 jumps for a layup, B1 jumps straight up in the air and clearly affects A1's shot/layup. Is this a foul on B1, or a no call? I know if B1 doesn't move his feet, it would be a charge, but since B1 left his feet to jump staright up, is this a foul or no? Thanks ahead of time for any help.