Before the ball is released on a free-throw attempt by A1, B1 in a marked lane space:
(a) with a foot, breaks the vertical plane of the side edge of the area between lane space one and lane space two;
(b) steps on the outside edge of the lane-line boundary;
(c) loses his or her balance and touches the inside of the lane with both hands; or
(d) extends arms over the area between the lane spaces.
(c). Legal in
(d), if there is no illegal contact. Stepping on or breaking (with a foot) the plane of any boundary spaces along the lane or around the three-point line are violations until restrictions end.
(9-1-3 g; 1-5)