This is an example of a defensive foul during post play action. It is a foul by the post defender if they flop/fake and then make illegal contact with their opponent. In this example, Black 25 is defending White 15 on a low-post move. Black 25 flops, and while falling to the ground, makes illegal contact with his legs on White 21 as he turns to shoot the ball. This is a defensive foul by Black 25.