During a free throw by A1, B1 is positioned just behind the three-point line at the top of the semicircle. Is B1’s position legal and what restrictions are in effect on B1?
The position of B1 is legal. B1 may move freely but may not break the vertical plane of the three-point line and the free-throw line extended with either foot until after the ball touches the ring or until the free throw has ended.
(9-1-3f PENALTY 1)