The Kark hurt his back and he's about to square off with somebody in spite of the pain. Celie's supporting him and looking tough, but honestly she should probably tell him to back off. Don't worry, Kingsley is probably swinging to the rescue. Or hiding, who knows with that shifty little cyclops.
The irony of narrative is here: in a story with a doctor, characters get hurt to give the doctor something to do. Authors are not benevolent gods.