[Jurassic Referee]

Originally Posted by BktBallRef

If he's disconcerting, call it.

If you don't know, then you either move closer so you can make the call or you preventive officiating by warning him not to disconcert the shooter.

But you have no authority to tell him he can't stand there.

..... there's no rule basis for what you did. It was wrong.

Agree. Those are your only choices, by rule. Warn/call.