I just saw the video on a co-workers computer, and wow! From the sound of the uppercut, I was sure she was out cold. I don't hit women, but my Mom once told me, son, I don't condone hitting a woman, but once she balls her fist and takes a swing, she is no longer a woman, and fair game.
It's fortunate that the driver didn't lose control of the bus when she hit him, though judging from the guy in front of the camera losing his balance, he almost did.
There is another video out there of a teenage boy hitting a bus driver as he is exiting the bus, and the driver is knocked loopy. The driver appears to lose control of the bus momentarily and drives into some pylons or something. Fortunate no one was walking in front of the bus while this happened.