"The Disk?" The Doctor's head canted. He'd never heard of such a thing, not in his universe anyway. Oh, that was a problem. Now his mind was shooting off in a million miles a minute. There was a place where people lived on a disk? How did the gravity function? What kept things from sliding off? How about thier atmosphere, or their orbit of the sun? What if there was no sun?
The Doctor grinned almost as though he was hypnotized or drunk - he was very busy trying to think of the next question he ought to ask about her world. Unfortunately his mind had already cooked up nearly a hundred.
"Not ordinary in the least," he confirmed, momentary disuaded from further questions. "You have a broomstick?" The Doctor canted his head. "I'd once run into witches that rode on broomsticks, didn't realize it was quite that common." Well, they weren't real witches, so he'd guessed that a real witch probably didn't ride a broom. Apparently, he was wrong.
"Well, we'll get you to either the theater or the gymnasium," he offered. "Oh, yes the little black book..." He was pulling out his own. "See here," he flipped the page to the map. "You and I are here, and the gymnasium and theater are here and there." The Doctor momentarily thought of bringing Granny back to the museum. It just didn't seem right to leave her out on her own. Though, he had a sneaking suspicion that Shannon would attempt to murder him in his sleep if he brought anyone else back.
"Now, here's the funny thing about these - they're used for communication. Haven't quite figured out how they work yet; but whatever you write in them everyone else will see." He pulled a pen from his pocket and wrote "See?" on an empty page. "Now, open up yours and have a look." He was fascinated with the journals. Really fascinated.