Sorry this is REALLY bothering me.
Tell this person that a snake does not need to have its food rammed down its throat like that. I have assist fed hatchlings and it does not need to be that drastic... key point, assist feeding rather than force feeding.
Any snake that is not set up properly cannot be expected to thrive, so until that is accomplished (and they are doing a VERY poor job of it) then the decision to assist should not be made.
This snake should be in complete isolation with minimal distractions. I will not even rant about them keeping it in a screen top cage with lights on it.
If this snake is anywhere public they need to move it out of the public space and into a private space. I would even suggest they drape the enclosure completely and give the snake darkness.
BPs are shy nocturnal snakes.
Do they know the age of the pinks they are feeding? Any pinkie less than a week old does not have adequate fat stores. They may be traumatizing this snake for minimal benefit.
Right now maintenance feeding is sufficient. That means giving the snake enough food to survive.
Every five days is TOO OFTEN.
I hope that helps.
If you are serious about helping this snake, then get your enclosure set up ASAP and get it out of that store so it can begin acclimating.
Bruce