Who says he hasn't noticed? From his silence may be deduced only any number of possible reasons for choosing not to speak.
"Extremely understandable. I am trying to figure out if I'm supposed to just assign you a fighting tutor whom I know to be competent, or leave you to flounder your way to your own. I have never been not-actually-a-father to a young lady before, and have no idea where the boundary lies between offering her a helping hand and strangling her potential."