Set ninety-seven years after a nuclear war has destroyed civilization, when a spaceship housing humanity's lone survivors sends one hundred juvenile delinquents back to Earth, in hopes of possibly re-populating the planet.
During my five year apprenticeship with Mr. Nakajima, I came to know much regarding his biography. After the war, he was unable to even return to Japan for several years, and once he returned little work was to be found in the sword arts. During his time in the United States, many people were students of Mr. Nakajima, but only myself and Francis Boyd undertook apprenticeships. Not once during my five years with him, did I hear of Mr. Nakajima having a Javanese apprentice anytime during his life. From your description, he seems to be a fake.
When Chan says, "I know I'm not young anymore. I cannot continue to make Rush Hour 1, 2, 3, 4, 5. How can I continue [to] do this kind of funny face," he pretends to throw a punch and then makes a face like Holy shit, that hurt , because it can hurt to punch somebody, often as much as being punched—a truth about human frailty that Jackie made into a comic trademark, as befits the Tom Hanks of kung fu movies.