At around 1:22, while filming a sword fight, Jackie Chan's arm was accidentally slashed by a sword. He went on fighting, and the footage appears in the film.
Snake in the Eagle's Shadow
Everyone abuses and humiliates a downtrodden orphan (Chan) until he befriends an old man, who turns out to be the last master of the "snake fist" fighting style. Jackie becomes the old man's student and finds himself in battle with the master of the "eagle's claw" style, who has vowed to destroy the snake fist clan.
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