I have come to realise the snap punch I was taught may not have been traditional TSD or TKD.
We were taught Korean names for the all hand techniques, but no Korean name was given for the snap punch.
Jack Hwang and Bruce Lee were good friends and may have developed the punch together.
I am only guessing.
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1968
-----------------------------Joe Lewis-----------------------Unknown------------------------Bruce Lee------------------ Jack Hwang----------------------------Bob Wall
Jack Hwang was 37 much older than the others in the picture.
He was able to do amazing things well into his
forties.