"Oh, you're the Antichrist," the Master says instantly, then pauses at the start of a new sentence to consider what he just –this is the problem with minds like theirs, too many levels operating at once– said.

Well, clearly this young man is not the really real Antichrist. Nevermind the fact that it's all Christian mythology; he's dreaming, remember?

"I met Lucifer a few minutes back," he continues matter-of-factly. "Nice chap. You two get along, or is there family drama?"