The Master notices Daine disappearing, and sends a telepathic Thank you her way before she's gone. Look at him being all nice. Probably cause he's suddenly in such a good mood.

"I just got here," he answers, laughing a bit at Andrew's enthusiasm. The Master finds he actually enjoys this quite a lot, this unbridled affection. He doesn't expect he'd recieve it if Andrew properly knew who he was, though.