Bob looked at the boy a little concerned? He was bleeding from his wounds and had a busted arm from being smashed earlier. "Is this really a time for a drink? You probably should see a doctor." Though if he didn't want to Bob would understand. The doctor really creeped him out a lot for some reason.
This boy also looked like a cold blooded killer. Not the kind of person Bob would like to be around with. Already this boy killed two people on this very street. And he didn't look the least bit remorseful. Smiling with an offer for drinks like it was a time for celebration. Bob felt a shiver down his spine. There was nothing stopping the boy from killing him next. Better to send him away.
Just to keep him a little bit more happy to make the daggers stay away, Bob broke the news to him politely. "Maybe next time. When you are a lot more...healthier... Though I think you might want to keep away from here for a while with the witness you allowed free." Despite saying that, Bob sincerely hoped that he would never see the boy. But who knows? They might run into each other again next time. If Bob was unlucky enough. And this boy might bring his troubles to him. How did these things happen? All Bob wanted to do was buy some things, have a nice meal maybe. And he HAD to run into a mugging and killing.