This bit of Captain Jack Sparrow’s backstory is amazing and makes him even better! Apparently all this backstory comes from the Pirates of the Caribbean: The Price of Freedom novel. Here is the synopsis for the book:
Twenty-five-year-old Jack Sparrow is a clean-cut merchant seaman pursuing a legitimate career as a first mate for the East India Trading Company. He sometimes thinks back to his boyhood pirating days, but he doesn’t miss Teague’s scrutiny or the constant threat of the noose. Besides, he doesn’t have much choice—he broke the Code when he freed a friend who had been accused of rogue piracy, and he can no longer show his face in Shipwreck Cove. When Jack’s ship is attacked by pirates and his captain dies in the altercation, he suddenly finds himself in command.
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It’s a real shame that they didn’t include the above expositional dialogue in ‘At World’s End’. People who’ve only seen the movies, & not read any background info, still don’t know about Jack’s slave-freeing exploit.