What happens to Feliks and Stasha in Wieliczka in the novel, Mischling?

Wieliczka, which is located near Krakow, is where Feliks and Stasha wake to find their horse missing and follow a trail of blood to find the Nazis in the salt mine. There is smoke over the city and abandoned personal items litter the streets, and the synagogue they sleep in is nearly unrecognizable as such. In the salt mine, they lose the bear and jackal furs, plus their weapons to the Nazis, and Feliks is shot. The Nazis fail to purse them and they manage to escape with their lives.