Someone's probably wishing he hadn't tried to emphasize the futility of the situation by being so descriptive right about now.
I'm not sure what one would call a woman knight, either. Granted, I know what I would be inclined to call one. I tend to think of "sir" as gender neutral when used as a term of respect, and I have trouble with the concept that it's not. That, however, is true of me with many words. I find it odd that we need two words for a lot of things based solely on the gender of the person we're referring to.
EDIT: Approximately 7 billion people have told me that a woman knight would be referred to as "dame" or "ser". There's specifics beyond that, but I'm just letting everyone know that I have been informed.