Hello Wei Lin!
As this is a rear leg kick, it takes longer to deliver and is much less efficient as a counter. A lead leg side kick would accomplish this goal with NO FOOTWORK necessary and full speed/power capability! A lead straight kick to the groin or abdomen would also be much more efficient, as would a lead stamping kick to the solar plexus! Just some things to think about!
Keep Blasting!
Sifu Lamar M. Davis II
Senior Instructor
Hardcore Jeet Kune Do
Sifu@HardcoreJKD.com
http://www.HardcoreJKD.com
Office (205) 956-1901
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