[JetMetFan]

Originally Posted by Snaqwells

The question is not whether his foot was moving, it is whether his body was moving.

Actually it's his feet...

NCAA 4-35-4
To establish an initial legal guarding position on the player with the ball:
a. The guard shall have both feet touching the playing court. When the guard jumps into position initially, both feet must return to the playing court after the jump, for the guard to attain a legal guarding position.
b. The guard’s torso shall face the opponent.
c. No time and distance shall be required.
d. When the opponent with the ball is airborne, the guard shall have attained legal guarding position before the opponent left the playing court.