Safer? We're in a wooden room, are we not? I light lamps in the castle all the time and it's perfectly safe.

[The whole "tree" thing hasn't sunk in yet. It's a strange wooden room to Naotora because she sees a room and the walls are made of wood. End of story. The fact that there is no paneling and the hole in the center of the room ascends as far as the eye can see is beside the point.]

I'm sure there must be some fuel somewhere. Whose castle is this, anyway?