[JRutledge]

I am not sure I completely understand the question but I will try to answer the best I can.

If you have a player hooking another player, it is a foul. It is not a violation. And it does not matter if they have the ball or they do not have the ball. You cannot hook or hold another player at any time. Displacement is really not the issue, because you can hook/hold someone without any displacement. All you have to do is restrict movement of that player.

Peace