Always, always save before trying to loot.
Telekinesis will not help, since the default action for the teleporter stone is not to pick it up. It doesn't matter where Kistandalius is, he will teleport you out of the back room. BTW, his opinion of you keeps dropping as you try this.
If you do not have a recent save, you can kill Kistandalius (not recommended, since he is a good source for spell books and rings/amulets, or put your other teleporter in a chest and download the inventory files for another set. I'll PM the details to you, which will be posted later today.
