Wait, it's cold over there. That's really bad for Yukiko right now since somehow she has a sudden fear of anything snow and freezing. But Rise looks ready upset and that Jack Frost isn't helping matters. It's too close to use the COMP but how else was she going to ask what was going on?

Obvious answer: call out to her from the line between warm and flipping freezing.

"Rise-chan? Is everything ok?"