Dance of the Drunk Mantis

Sam Seed treats Foggy with extreme cruelty immediately upon discovering his wife has adopted a son. The abuse appears to stem from Sam's reluctance to accept an adopted child into his life, combined with his harsh personality. This torment shatters Foggy's sense of security and drives him to run away from home.

Earlier scenes establish Sam Seed as a stern master who uses harsh training methods, hinting at his capacity for cruelty toward those he sees as unworthy.

After running away and working at an inn, Foggy overhears Rubber Legs plotting to kill Sam Seed. Despite the abuse he suffered, Foggy chooses to return and warn his adoptive father, showing that he still cares about Sam's wellbeing. This act sets the entire conflict in motion.

Rubber Legs intends to kill Sam Seed to seize control of the powerful Drunk Mantis style, which combines Drunken Fist with Mantis Fist. He has developed a lethal hybrid technique that blends his Northern style with the drunken impulse, making him nearly unstoppable.

Sickness Boxing is a dreaded, unconventional martial arts style that Foggy learns from a sickness teacher while seeking herbs to cure Sam Seed's mortal illness. This brutal discipline transforms Foggy's fighting approach, giving him the power needed to confront Rubber Legs but also feeding his inner turmoil.

Foggy uses his newly learned Sickness Boxing technique to defeat and kill Rubber Legs in a climactic fight. However, the victory is marred by Foggy's loss of control - he murders his enemy in a moment of uncontrollable rage, marking his fall into violence.

After killing Rubber Legs, Foggy enters a trance-like state where he sees Rubber Legs' face whenever he looks at his adoptive father Sam Seed. This psychological trauma causes him to attack the very person he was trying to protect. The film ends with a freeze-frame of Foggy lunging at Beggar So, leaving his fate ambiguous.

The Sickness Boxing training is described as reshaping Foggy's mindset and deepening his inner turmoil, foreshadowing his loss of control.

Beggar So travels to the inn to confront Rubber Legs and fights him despite being outmatched by the hybrid drunk mantis technique. Though he has no special defense against the combined style, Beggar So manages to defeat Rubber Legs through sheer skill and endurance, though the victory costs him greatly as he collapses mortally ill from the exertion.

Foggy's violent impulse is triggered by a psychological trance where the memory of Rubber Legs resurfaces whenever he looks at his adopted father. The trauma of the killing and the intensity of the Sickness Boxing training have fractured his mind, causing him to see his mentor as his enemy.

Beggar So defeats Rubber Legs but immediately collapses from the injuries and exertion of the battle. He becomes mortally ill, forcing him to send Foggy to seek help. His victory comes at the cost of his own life, making it hollow despite defeating his rival.