Benedict is here because he thought he was doing a favor, and was dismayed to see that this was both not the case and included Kostos. But he's behaving himself, more or less, keeping his grousing to a minimum and writing today off as a necessary evil if he wants to keep prioritizing the cushy duties of a chamberlain. But he'll never be a scout, he can say that much.
He ducks down quickly with a sour, unnerved expression, recognizing the Venatori as well. It seems he'll never be free of them, nor, perhaps, they of him.