I am seeing various ranges in the left hand in brush knee twist step. Yang Jun's Left arm sweeps out lateraly high at chest shoulder level then comes down to thigh/knee.
I've seen brush knee also performed where the arms sweep out low and finishes at thigh/ knee level.
Lastly the Brush Knee that sweeps using the left arm high is actually called 'fair maiden plays shuttles' to cover the crown of the head.
I've seen this medium level sweep in the Wu style fast frame as well.
What is the main technique that brush knee is most commonly associated with? 4 corner's splitting?