It's about this time that a skeleton shows up - not Sans, though, it's one of his dogs. Roman charges onto the scene, boney toes slipping across the stone as abruptly comes to a stop at Peridot's side, chattering noisily at Frost and the melting book.

Since that probably won't work, they quickly move to trying to pick up Peridot into its mouth. It clearly has the same thing on its mind that Sans told everyone to do - escape right now.