"You're not making sense." The Doctor rubbed the back of his neck a moment.
"Koschei and I left Gallifrey when we were just two hundred. Maybe a little older. Took one of the youngest of the Lungbarrow cousins with us, and an old TARDIS. Traveled a lot. Got exiled for a while, Koschei really didn't like being on Earth that long. He got his own TARDIS after that. Didn't always use it, sometimes he'd come with me."