[The sneer van Zieks's expression twists to at the sight of the detective and... whatever the hell he's brought along with him would be plenty to get most people to go away and leave him be. Unfortunately for Barok, Herlock Sholmes is not most people.]

My collaborator took charge in the matters of the bar itself, and required little input from me.

[So there's the explanation you're wanting as to why it's not a gothic castle with extremely moody lighting, detective. He pointedly does not name Diluc, as if to shield him from suffering this man's influence, somehow.]

One would assume that the purpose of entering a winery would be to partake in the drinks offered there, rather than bringing your own.