His automatic reaction is to be all oh, no, that's fine, which. Is ridiculous, he was going to get a drink (or twelve) anyway and Shrieky is his friend, this is what you do with friends. "Um... sure."

Concerned Looks put Wolfgang on edge, which he knows is ridiculous and unfair. If he could just say no, I'm not okay, it would be different, but instead he feels the need to maintain this illusion that literally no one else is buying because he thinks it's more polite this way. He's angry at himself for not being able to shield other people from it better.

He shifts from one foot to another, trying to pull it together. He used to be able to do this. "Ah, I don't... there's a pub down this street, I think." That seems more respectable than just a bar, and he really is going to try not to get as drunk as he had initially planned on.