Wing Chun Martial artist here
LB
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block opponent with right and set left for backfist
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Once set, at the same time, left backfist and slide right hand down to opponent hand/wrist, then drop the left hand and lock opponent hand/wrist otherside
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once wrist is locked, at the same time, step behind opponent with left foot and pull opponent to the right
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stop, and do a hard back left by stepping in front of opponent while turning the knife back towards opponent
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there is no step 5
Questions?