@Thalasou: The +4 discovery bonus is for using his weakness, which you don't know yet. Using a listed skill enables you to influence him at all.
@Delena: Please remember to move your token.
"Thank you." The Duke replies, running a hand along the arm of his wheelchair, as if polishing it. "I've made quite a few improvements to her myself. One day, I'll race her against a horse!"
A minute later, he smiles at Delena, "You're most kind! I wish others understood as well as you. Pray tell, which countess do you speak of?"