"Yes, and I'll kill any house elf that touches my research notes. We've already established that with the Malfoy house elves," he answered with a grin. "Besides, they clean everything, it's just the papers that are spread around. If they didn't clean, there'd be chalk powder all over this room."
Stephen turned and frowned. "What the hell are you talking about? Why would people see us? The world is a big place and I'm not planning on going anywhere wizarding. I stick to the Muggle world when I want to have fun and in all this time, no one has ever found me. You wouldn't have either if I didn't want you to. I would have Disapparated so fast that you'd thought you'd be imaging things."
He laughed. "Yes, but if I do that, four people might die." He thought about the comment and shook his head. "No, he couldn't kill everyone in the room or even anyone coming in, because he would have visited, someone else was there too from the injuries Allison had. They would have been hexed, too. The spell would have to be conceived to strike the rescuer and not some random person coming in, which is why it attacked all three and not Allison. If he meant to kill Potter on arrival, or shortly thereafter, he didn't need to kill her, because she'd still be his prisoner. Her injuries untreated would have killed her anyway. The only reason she's alive it's become they brought her to St. Mungo's. No, I have to change formulas to consider that only the rescuer would be hurt."