Vincent kind of takes this at face value first, filled both with relief and with a certain quiet delight that Irahl's just learned he has a favorite drink. The rest of the implications won't settle in until after he's already started smiling and verbalizing his first and most natural reaction.

"Then congrats, man. Learned somethin' new."

He raises his glass a little in sort-of a 'cheers' gesture before he finishes off the latest of his own drinks.