"If he’s going to take the ring," Draco said sharply, clearly losing his patience, "then he’s going to do it in the next few days, and we are in  no position to leave the castle without being noticed," Harry opened his mouth to speak but Draco continued speaking loudly above him, "No, Harry - there’s no point in us running out now, with no plan, no way there, no way back, no plan on staying hidden, no idea what curses there are protecting the ring, or a plan of how to deal with them. Do you not remember Dumbledore’s arm? Hmm?" Harry fell silent. His mind drifted back to the dream - to what Voldemort had said about Draco. The idea of that being Draco’s arm was unacceptable.