The crawling heat's a contrast for their outside-chill-acclimated skin.

They're mad. They're attacking the castle. They're...giving off a familiar feeling.

...are they looking for something to FIGHT?

Frisk start to shiver, and they can't stop. The smoke punches down into their lungs, ruining the slightest chances of not being discovered with awful hacking that echoes far beyond this hall, even after they shove their hands over their entire face.