"You don't know what a soul is?!?" [Undyne sits straight up and just stares blankly at the plain doll.] "It's the most important thing ever! People and monsters have souls in order to live! And in my world, we need 7 humans souls in order to break free from our imprisonment!"

[Thankfully, she's not looking at her feet either. No need for creepy paranormal stuff on the day where you nearly died, after all.]