"Yes," is all he tells her, an agreeable, but terse, yes.

With his good arm, he reaches to help Natasha down, out of the contraption, because that's really the first thing they need to do, in Bucky's opinion.

Then they can find water. He's pointedly not looking at his arm, areas where the acid burned through to the bone, blood still seeping out, skin red and inflamed. Bucky's eyes stay focused solely on Natasha.