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.
Violation in (a), (b) and (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.