Well, you have character traits for the knights, right? I was wondering if it could be fun for the surgeon to start talking about them using humor theory... That is, the idea that the body has four basic fluids, and your temperament depends on the balance of them - too much blood and you become too sanguine, that is too lively/too much of a risk taker, too much yellow bile and you become choleric, that is aggressive and angry, too much black bile and you become melancholic, so emotional and depressive, and too much phlegm and you become phlegmatic, so lethargic and listless. You let particular fluids out to correct imbalances of temperament for this reason. I guess I think of that as the archetypal medieval medicine thing and it has some fun potential, it might not fit here but it just sprang to my mind.