Nico pulled her hand away from her mouth, licking away the drop of blood her chewed hangnail had left behind. Not that she didn't understand the impulse behind this guy's actions, but she hadn't exactly been eager to see three people murdered right in front of her, much less in front of Dipper and Mabel.

"There are emergency escape route maps in the hall," she said. "We can start there. Considering what they were planning on doing here, I doubt there are any rooms in the building that aren't on those maps."

They might need to peel a map off the wall and check off every room as they cleared it though, just to make sure there weren't any somehow mystically warded to make them skip it.