1. I had a mugging attempt in a bad part of Saigon (by the slums by the river after exploring) and I kicked one of the muggers in the stomach and shouted at the other.
2. I got into a shouting match with a gangster in a McDonald's who had been yelling at the employees and spat on the floor, and was otherwise being a jackass. I told him to knock it off, a shouting match ensued, and later two police officers came, one with riot gear.
The closest I ever came to jumpkicking was when I got into a fight in a brothel when they tried to shake me down for extra cash afterwards. I kicked one of the guys after he grabbed me roughly. But even then, I didn't jumpkick - that's more of a movies thing than a real life thing.
Anyways, I can understand your skepticism, though the rudeness is unnecessary - you could just ask if you wanted details.