Rule: 4:1:1-2
An airborne shooter is a player who has released the ball on a try for a goal or has tapped the ball and has not returned to the floor. They are also considered to be in the act of shooting.

So if a player is in the air attempting a shot, and gets displaced before landing by a defensive player either trying to block the shot or boxing out too early it is a foul.

Rule: 4:11:1-2
Continuous motion applies when a foul by the defensive player during the interval which begins when the habitual throwing movement starts a try or with the touching of a tap and ends when the ball is clearly in flight. If an opponent fouls after a player has started a try for a goal they are permitted to complete the customary arm movement.

If an offensive player is driving to the hoop and is about to attempt a shot and is fouled while in the act of shooting, they are allowed to complete the shot.