Bing Shi would always accompany Hasan outside to visit the tea houses, circuses (that's where she got her pole from), and brothels, to have "fun".
In reality, she was checking out the performers — their competitors, or in short, rivals. She was looking for a way to outperform them, from the tiniest detail such as makeup and costumes to the play itself.
They didn't need to be the best. They needed to be better than others. If she gave them famous songs and lyrics from modern times, how would they grow?
Bing Shi didn't want to steal their limelight. Pushing the girls to the limit, she didn't offer them anything on a golden plate. Stolen work would only lower their self-esteem, giving them no sense of accomplishment.
What they needed was to see their true strength and all the benefits that came with their hard work. Bing Shi took the job of maneuvering the girls to the image in her mind.