Kenshiro learns that the other prisoners transported with Lin are being held in a separate prison camp in a nearby valley. Ken manages to break the imprisoned villagers free, but they are all killed in an ambush led by Mr. Heart, the last of the Four Jacks. While Mr. Heart's excess flesh proves resistant to his attacks, Ken eventually uses the Hokuto Juhazan technique, which allows him to overcome Mr. Heart's defenses and strike his vital point. From his battle with Mr. Heart, Ken deduces the true identity of King.