premise: None of us will forget the images of sumo wrestlers stomping to drive out demons as the games began, of the glorious Ode to Joy and mass choirs and choruses around the world, of starry-night closing ceremonies and flower-laden horses, of floodlights dimming and thousands of paper lanterns becoming a shimmering sea of light.
hypothesis: Stomping of sumo wrestlers is ceremonial 
reason: The paragraph states that the stomping is to drive out demons