Free Throw situation

[hoopguy]

I have noticed a lot of the following watching from the stands and TV in the last few years. Player A1 has multiple foul shots. On free throws before the last/live free throw, the player who has the responsibility for boxing out the shooter, B1, 'boxes' out the shooter and clears the shooter off of his/her spot on the free throw lane, often moving A1 back a couple of steps. This seems to be a common practice in the last few years. To me this is an obvious tactic of intimidation. Why box out the shooter when the ball is not to be live other than to intimidate or gain unfair advantage by moving A1 off his spot and possibly disconcerting him?

Not sure how to clean this up. Any suggestions? Am I wrong, should this be okay by the spirit of the rules?