One day Duan Jingzhu steals a precious swift steed called Jade Lion () which belongs to a Jurchen prince. He intends to present it to Song Jiang, then the second-in-command of Liangshan Marsh, as his ticket to join the band. But on the way, he is intercepted by men from the Zeng Family Fortress, who snatch away the horse. They also mock Liangshan when he tells them the horse is meant for the stronghold.