"Don't talk to me like that," Jack said, attempting a warning, but he could hear the nerves in his voice. Why couldn't he control himself? Why couldn't he hold it back? He should be able to hold it back.

"You're not him," he repeated, although he knew the creature, whatever he was, had already admitted he couldn't be the Master. Hadn't he? Or at least he thought he had.

He turned, ready to ascend the stairs. He wasn't going to stay here.