That's just a medieval medical journal.

When you’ve endured an existence fraught with trauma and you are past ready to go.

Relevant

You know how furry animals don’t seem to mind having hair in their eyes when it bothers us immensely?

Same sort of thing. They were so used to being stabbed back then, because it was super common, that it was just a boring part of the day.

no time to reaction

You'd also probably be OK with getting stabbed, if you lived in the mediaeval period.