User blog comment:Dragon´s Blade/World Coexistence Alliance/@comment-24376783-20141107061145/@comment-24376783-20141107173034

Scarlet and Nina were waiting for them on the other side.

(Note: The bookself, wall, and floor spin around 180 degrees when you flip the switch. There's a bookself on either side of the wall with a lever behind it that activates it.)