They get some of it from the edge of their vision. They've gotten a lot of practice with sign at the castle.

"Um?" They actually would like something to drink now. What they want more, though, is for Toriel to go away. They like her and they were friends, but Kris and their SOUL is something that screams more important right now.

So they shake their head quickly. "No. Thanks," they mutter.

It's good Kris can sign, 'cause they're not going to be able to talk after this.