"So at least one of the possible obstacles is in effect."
The tree looks like an abandoned house. It hasn't accumulated much dust, because it has no air holes. It is lit by fairylights and has some shriveled-up fruit in the cupboards and what is probably a bookshelf hidden behind a layer of wood for some reason and, on top of the bookshelf, a bed.
"Giving permission worked tree-fashion, but revoking it worked vampire-fashion, which is to say not at all since you didn't nail any crosses to anything. Well, that's an interesting interaction."
"I see. Well, now you can get into my old tree..." She shuts the gate. "If I leave the door open."
"I've set the new gate to the new continent now just on top of the one to the tree."
Except that as they approach the library room in the school building, he stops suddenly in the darkened hallway.
"Someone there," he says, quietly. (There is a tiny bit more light coming around the corner than there should be.) "H'sh." And he steps closer to listen.
"...sure there are any number of better ways you could be spending a Friday night." Pause. "Patrolling, for example."
"Yes, well, I'm personally offended by Catherine Madison's decision to steal her daughter's body, so here we are. I will patrol when I'm satisfied we have a workable countercurse."