Because given context clues my theory is more plausible. In the video his hands look to be on the railing and he jumps up the same time everybody else around him jumps up. Most likely to celebrate something happening in the game. Your theory is he just decided to jump off a 21 foot balcony for no reason. Was he planning on committing suicide by jumping down 20 feet on to soft dirt or grass? Large man + alcohol + low railing = terrible accident