"Okay. Because you might look like I could take you on, but I'm not much of a fighter and I still have a broken rib from the last guy who thought I was playing on his turf."

Not that Bach couldn't handle him in other ways, but people might notice this guy suddenly becoming Bach's little pet. It's a too public place. "Oh, I usually just drink a lot of water, I don't have the money to get to real drinking."