OT:this reply is compltely on topic
no really, it is
I'd teach them this one part of chum kui, where youv'e just pulled to one side, launch a wong gerk/sidekick then step down in the ong sau/wu sau structure.
now the tricky part come where you move your hands into the other structure, this is done FWIROMHO* so that you have space in which to send the elbow back up, thus createing that next step.
the movement of the elbow to the settled posture could coinide with the slight rise of the forward knee creating space for the step.
ie drop elbow, raise knee, bong sau, step/bui ma, stop with bong sau, drop elbow...ect, till the uppercut (yup thats all that is, an uppercut ) this would result in two distinct steps. a slight, but definate picking up of the foot with the droping of the elbow, then an equally obvious dropping and pulling with the bong
However, after some sample steps I believe the form should more settle or drop into the position after the bong sau, useing the 20/80 weight posture, adducting the drop of the elbow from a rooted position. then bongsau, step/bui ma, settle,bong sau, step/bui ma. settle. in other words the bongsau should begin before the step, and end with the step.
hey this is the section of CK you see that guy do before the karateka flattens him(in that mcdojo vid). thats why you gotta practice!
ok i sleep now.
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