Regardless of whether this lady is from PRC or Hong Kong, it doesn't matter.
What I saw form the video is that the African American have punch the first strike, however, she get a uneven collateral damage multiplied by 10, with BRUCE LEE PUNCHES AND KICKS forcing the African American to be out of the Bus.
I think the quarrel is due to a dispute about seats...
Wow, I didn't know that San Francisco got so many Chinese... perhaps that's China Town?
What I understand about USA, is that the some African Americans do not really welcome Chinese, or Asian at all... they always have a bitter believe that the Chinese and Asians have taken their jobs...
So, in this situation, it's quite similar to Singapore FT case isn't it?
In USA, the Asians are really hard working, however, some African Americans are pretty laid back, and when jobs are taken they play the blame game.
I was once being treated like a 2nd Class Citizen in an Airport of USA, and guess what, it's the African Americans that treat Asians that way... I sure know how a 2nd Class Citizen feel... (anyways, I was just a tourist then, but it left a very bad taste afterward)