Thanks Snaqwells and BillyMac for getting me back into my NFHS rule book.
Rule 4-11-1 Continuous motion applies to a try or tap for field goals and free throws,
but has no significance unless there is a foul by any defensive player during the interval which begins when the habitual throwing movement starts a try or with the touching on a tap and ends when the ball is clearly in flight.
Rule 4-23-1 Guarding is the act of legally placing the body in the path of an offensive opponent. There is no minimum distance required between the guard and opponent, but the maximum is 6 feet when closely guarded. Every player is entitled to a spot on the playing court
provided such player gets there first without illegally contacting an opponent. A player who extends an arm, shoulder, hip or let into the path of an opponent is not considered to have a legal position in contact occurs.
Rule 4-41-1
The act of shooting begins simultaneously with the start of the try or tap and ends when the ball is clearly in flight, and includes the airborne shooter.
Rule 4-41-3
The try starts when the player begins the motion which habitually precedes the release of the ball.