they see you walk near the cell, where Sans and Papyrus were.

Sans: oh great another one…what kind of WONDERFUL test do we have today? he askes in a sarcastic tone

Papyrus: SANS... I'M SCARED.. Snuggle up to Sans.

you see they have cracks on there bones and Sans looks exhausted

Sans: so? What kind of torture do we have to endure today…