Free throw positioning question

[smginnis]

Originally Posted by mbyron

You are told incorrectly. Not a violation.

Casebook:

9.1 COMMENT: While Rule 8-1 clearly states which marked lane spaces must
be occupied and by whom, a team forfeits its right to any space not occupied
before the free throw starts (when the ball is placed at the disposal of the free
thrower). Once a free throw starts, no player occupying a marked lane space may
enter or leave such space or break with either foot the vertical plane of any lane
or lane-space boundary until the ball touches the ring or backboard or until the
free throw ends. Players who do not occupy a marked lane space may not have
either foot break the vertical plane of the free-throw-line extended and the vertical
plane of the three-point line until the ball touches the ring, or the backboard,
or the free throw ends. No player may enter or leave a marked lane space after
the ball is placed at the disposal of the free thrower until the restrictions have
ended as outlined.

If "the space" is defined by the area within the marked lane space and the vertical planes created by the marked lane spaces, I'll make an argument that a player is leaving "the space" and "entering" a new space by moving parts of their body (i.e. torso, butt, arms, hands) outside of their marked space and into the space next to theirs.

I may be wrong, but I hate the idea of allowing kids to stick their arms across another lined up player. Patty cake and fouls soon follow.