"There are two options with the stone," Caractacus made no move to stand, "Either you remove the enchantment, or I shall return the object. I do not have the time to work through another puzzle at present, and I will not have an item that was freely given to me and is currently in my possession tampered with at another's will. It is unreliable, and unreliable devices are dangerous. I do not need an object in my lab or my rooms which has the potential to harm myself or others at any moment. There is little to be gained from such devices, and much to be lost."