The wedge is a passive movement where you insert a tan sao long enough to create the wedge and insert another strike. As soon as the wedge is inserted, the skilled opponent who has trained trapping and energy/sensitivity drills will take that moment to lop sao the wedging hand, using the arm that it "wedged" to lop as they strike with their now free other hand! Hope that makes sense to you! Things like this can be shown much easier than explained on a forum!

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