Holly runs as fast as she can but the demon's faster. She has no idea where Lightning's gotten to; maybe he found a tree to climb. She on the other hand has been diverted into a treeless hill and she's careening down a slope, trying very hard not to trip.
And the demon's gaining on her.
She's never seen anything like it and neither has Crystal; maybe Book knows what it is but Book's asleep. It's mostly mouth - it looks like a cross between a floorlength mirror of a mouth and a snake to propel the mouth along.
And Holly's not fast enough.
The mouth catches her.
But it doesn't hurt.
Where are we?
"I don't know, but we don't want to try it. We have been eaten by demons enough. We wouldn't be a good test case anyway since we're unusual."
Sherlock giggles. "I won't suggest that you experiment, then. Does the cage full of mice serve some sleep-related function?"
"Yeah. Trading off cohabitors fixes mental tiredness but not physical tiredness, so the mice take that. They're good if we have an injury or get sick, too. I could use more, a bunch of ours died when we killed the first demon we met. Then - the one with the - portal face."
"You don't, strictly speaking, need sleep-mice around here. But I could look for some, I suppose."
"I'd be more inclined to agree if vampires didn't catch fire in sunlight. Rather limits what I can do during the day. Sleeping is a nice alternative to boredom."
"You'd have a much harder time where we're from," she says. "There's usually at least one sun around. But we can stay awake and think at each other, and this book is turning itself into a Nlaaki-to-English textbook as we speak."
"It loses its content eventually, but the more of it there is, the longer it takes to fade," he says. "As I understand it. The book is not technically mine, I just happened to know it was here."
"Good question. We could always try asking. Well, you could; I have to be back home by sunrise, and the owner of the book is not likely to show up until well after that."
"The librarian in charge of this library, I believe. Many of the books belong to the school, but a lot of the good magic-related ones are his. I've never met him, but I've gone through his desk a few times. He seems nice enough."
"The kind that teaches a lot of largely unwilling teenagers things that they don't especially want to know."
A sand, says the footnotes, is about an hour and a half.