Also notice the relative lack of anger among those struck. If this happened most places in the USA, the first reaction would be shouting and arm waving.
I was in China last year and I loved the traffic. In America people have an expectation of a "Right of way." This concept does not exist in China. In China there is an expectation of "I'll get run over." So keep moving and don't hesitate. For the most part it works quite well.
I saw a Chinese driving school a few years ago (on the runway of an old WWII Flying Tigers base). It seemed to consist entirely of students driving SUVs very slowly in a tight circle, well worn into the clay of the field.
3:45 or so... the entire god damn road is open and yet two people on tiny scooters or bicycles or whatever somehow manage to ride directly into each other. It's like they're high or something. How is it even remotely possible?