Chainslock
How could she sap, she just probably heard, since apparently she was riding one of the horses of the soldiers? But look her escape is not realistic. Since these are soldiers and not majors, they are used to killing, accustomed to obeying orders. To miss a captive or a guest for them at least get a penalty, at least lose their heads. So they would not miss her. It may not be raining like a bucket, but raining like a wall of water, one of the possible options. The author knows best, since he knows his world better. This is probably not the power coming from the heart, but shock, an adrenaline rush, the first hour, a person does not feel all the pain, and it comes later, after 1 hour. It rolls with terrifying pain from which it darkens in my eyes (from personal experience when I broke my arm). Probably not mumbled, but shouted at the top of their lungs or barely audible moans broke from their lips? Coughing maybe blood? Did his lungs, broken ribs damage him? Is something strange for a king in the presence of his knights and soldiers kneeling before a witch's apprentice? Unrealistic. But then it is so customary in the novels of medieval Europe (an example is Captain Fracas Theophile Gauthier).