Free throw positioning question

[AHSAA_Ref]

Originally Posted by mbyron

I don't think it's unclear. You leave a space by entering another space, which you can't do by waving your hands. That's one way to violate.

OR, you can violate without leaving if you move your feet through the boundary of the space.

What's unclear?

What is the need for BOTH then? I mean, if the ONLY way to leave the space is to put your foot in it, why the need for this, "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.