The morning after her wedding with Kahan, Fortitude is having a bad problem.
She is lost in the cave, and she doesn't know how to get out. She doesn't know where Kahan is, either. This is the sort of problem people die about; Fortitude knows this fact and it makes her darkly calm. Screaming at the cave will accomplish nothing. She makes rock piles to indicate where she's gone and she uses her lighter to figure out where the air currents are and she follows them.
She is probably going to die. This is, she thinks, a Good Death. As the nurses in the medical caravans say, she will die on her feet.
And then she turns a corner.