From what I have heard from people who knew him closely is that he was indeed beligerant, and was attempting to start a fight with the people on the balcony next to him. They attempted to calm him down and succeeded until he began arguing with the people a balcony below him, where he lost his balance and fell over, with the railing not giving out, staying in full contact.
Such a sad story, I feel terrible for his family, friends, and the tight nit community that St. Xavier is. You have to feel for his best friends that saw this happen... that would be a sight you would never get out of your mind and have to live with the rest of your life