Well, I would kindly get out of my seat, take my seat and continually slam on it on his head until he's unconscious. After that I would check his pockets for money. If he has any, I would generously tip the bar tender (not out of kindness but for the chair), then I would call a cab. After I get into the cab with my "beautiful woman" I would instantly demand road-head to relieve any levels of stress.
The cab driver would be completely comfortable because she would be an escort I hired prior to the whole event taking place. After that we would head to the secret destination I had planned. From there my escort would proceed to punish the beautiful woman for putting me through so much trouble (it would've been the outcome either way). After that I would have to poison them both for taking up too much of my time. Then I would let someone else come in and have there fun with mutilation and all that stuff and them take care of the mess.
Now all of this could arise a lot of questions, like how would I do all of that, but that's not important. So don't ask. It would just happen. Like rain falls from the sky, everything would fall in my favor. That's all of course assuming the man who walked up had aggressive intentions. I still don't know if he is an aggressive type or a passive aggressive type. Would he hit me in an instant or follow me for a week trying to create some impossible way to undermine me? None of that is clarified.