Trouble? [ there's just a little bit of a lilt in his voice, like he's trying to act surprised. ] I was just doing my job.

[ he flicks a bit of dust (or possibly nothing) off his jacket. who knows where that dude had been? apparently another bar. what an idiot. ]

That's not something you need to apologize for. He probably got kicked out of that one, too. As long as he's not following you around.