Legal Guarding Position?

[VaTerp]

Originally Posted by bob jenkins

4-23 Guarding

ART. 4 . . . Guarding an opponent with the ball or a stationary opponent without
the ball:
a. No time or distance is required to obtain an initial legal position.
b. If the opponent with the ball is airborne, the guard must have obtained legal
position before the opponent left the floor.

Thanks.

Is there a case book play or somewhere else where this is referenced?

I've only heard NBA officials use the term aligns.