li_siao_lung -
dont know what you mean by 'rolls'??? And as for how is power generated, well in straight punching it should come from every joint doing adding its own bit. Wrist, elbow and back. No huge shoulder input. When you punch with turning then spinal column, waist and the legs come to add there bit too. It is about total body unity, as in any striking art.
Fa Jing -
"The chick in that picture the one with the long hair what is she doing? Looks like a really high bong sao, looks to me like a kau sao."
She is performing pun sau. She is rolling with a bong sau and fuk sau hand positions. Kau sau is where you come across the centreline with both hands in this position:
