[Scrapper1]

From the the Block/Charge guidelines on nba.com:

A defensive player is permitted to establish a legal guarding position in the path of a dribbler regardless of his speed and distance.

A defensive player is not permitted to move into the path of an offensive play-er once he has started his shooting motion.

A defensive player must allow a moving player the distance to stop or change direction when the offensive player receives a pass outside the lower defensive box.

A defensive player must allow an alighted player the distance to land and then stop or change direction when the offensive player is outside the lower defensive box.

A defensive player is permitted to establish a legal guarding position in the path of an offensive player who receives a pass inside the lower defensive box regardless of his speed and distance.

A defensive player must allow an alighted player who receives a pass the space to land when the offensive player is inside the lower defensive box.

A defensive player must allow a moving offensive player without the ball the distance to stop or change direction.

The speed of the offensive player will determine the amount of distance a defensive player must allow.

If an offensive player causes contact with a defensive player who has estab-lished a legal position, an offensive foul shall be called and no points may be scored.

A defensive player may turn slightly to protect himself, but is never allowed to bend over and submarine an opponent.

An offensive foul should never be called if the contact is with a secondary defensive player who has established a defensive position within a designated "restricted area" near the basket for the purpose of drawing an offensive foul.

The "restricted area" for this purpose is the area bounded by an arc with a 4-foot radius measured from the middle of the basket.

EXCEPTION: Any player may be legally positioned within the "restricted area" if the offensive player receives the ball within the Lower Defensive Box.

The mere fact that contact occurs on these type of plays, or any other similar play, does not necessarily mean that a personal foul has been committed. The offi-cials must decide whether the contact is negligible and/or incidental, judging each situation separately.

Good call, All Heart.