Consider this not too unlikely case:
Shot in the air. A1 is coming from the top of the key while B4 is coming in from the side. B4 anticipates the rebound and jumps for the while running full speed. However, the rebound goes straight to A1, who is running down the lane. B4 lands on A1 as A1 is now jumping to shoot. B4 is an airborn player who's landing spot was vacant when he jumped. Is this a foul on A1? Or is it a foul on B4? Or is it nothing?
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