Hello Wei Lin!
I don't know where that notion came from! That IS NOT the way that Bruce Lee taught, nor should it be the way his art is taught to others! The guard hand is below the chin and inside the lead shoulder, right on the centerline! The position can fluctuate as needed during striking, but should stay on center BELOW THE CHIN ... NOT beside the jaw, until needed elsewhere! This position faciliates ease of movement in going to any of the four corners with equal speed for lin sil die dar!
Keep Blasting!
Sifu Lamar M. Davis II
Senior Instructor
Hardcore Jeet Kune Do
Sifu@HardcoreJKD.com
http://www.HardcoreJKD.com
Kwoon (205) 274-9011
"Hit Hard, Hit Fast, Hit First - ALWAYS!"
"What is Jeet Kune Do (JKD)? Chinese martial art, definitely! It is a kind of Chinese martial art that does away with the distinction of branches, an art that rejects formality, an art that is liberated from tradition." __Bruce Lee