This video shows side A (step and punch) but also the B side (the defender) In this video it show two important hands the Fok (which sweeps the punch off the centerline and the Tan which opens the centerline up for attacks. Both actions of Fok and Tan when used in combination slows down your opponent attack by forcing him to cross over his centerline causing the X factor which makes it easy to set him up for traps and jams...

https://www.youtube.com/watch?v=geguCWUdxBY
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