The emperor decided not to participate in the finals of the World Polo Competition under Pei Mian's threat to die.Armor Khan Nasha, alias “Natie”, led four polo players to sneak into Chang'an, and cooperated with the female spy Thirty-six Niang who had been lurking for fourteen years: 28 barrels of tung oil were buried under the stands of Qujiang Polo Ground, and then the “Shengshi Polo” modified with sulfur and saltpeter was used to hit the dragon ball mechanism with the intention of detonating the stands.