This is an example of a charging foul. An airborne shooter is responsible for contact if the defender has established a legal guarding position with both feet outside the Defensive Semi Circle (DSC). This means the defender must establish legal guarding position prior to the offensive player leaving the floor.

In this example, White 3 defends Blue 13 on a drive to the basket and establishes a legal guarding position outside the DSC - with his left foot completely on the floor outside the DSC and his right heel in the air over the DSC. Blue 13 then makes illegal contact with White 3. This is a charging foul by Blue 13.