"Right, but we can at least rule out the possibility that incinerating or disintegrating the rock somehow caused it to reappear intact next to its body," says Mial. "Which seemed to be the sort of thing she was worrying about. Because if no such thing happens, the rock will remain in a separate universe from the body and consequently unable to operate it, is I think the going theory? For that matter a transworld scry can also verify that that part worked out as predicted."