In ceremonial costume, a group of chilangos negotiate with motorcyclists from a rival neighborhood, planning a reenactment of Victory Night, when Hernán Cortés and his army were driven out of Tenochtitlan. With jittery-smooth video and sparing use of an accredited historian, Julio Hernández Cordón explores the significance of the 500-year-old Tree of La Noche Triste, climbing the fence with his subject-collaborators to survey its charred remains.