Well actually Ed Parker addressed that issue and Bruce agreed and sent a message to Parker in the movie Chinese Connection. The big Russian had Bruce down in an arm-bar and Bruce couldn't get out. Then the light came on and Bruce opened his mouth wide and bit down on his leg as hard as he could. The Russian released, let him go, and jumped up wide-eyed.
That was an in-joke between Parker and Bruce. Later that in-joke ran its course in the movie Enter The Dragon, when Bruce did the same lock on Sammo Hung, who instead of biting, tapped out. Bruce then stood up and schrugged his shoulders.
Bruce spent a short time with Wally Jay, who pronounced him a "nice kid, but don't know very much." Bruce was ultimately taught to grapple by Gene LeBell, and employed LeBell as the primary stunt man on the Green Hornet Series. LeBell has been doing stunts ever since, and still is.
I wish you guys would stop rattling my memory.