Witnessed an accident.....

I'm riding my motorcycle just behind a bus...in front of that bus there is another bike.... The bike became caught in an accident with the concrete side wall and the wall fell entirely to him....I Stop my vehicle and try to pull up the wall and some Men also help and we remove the man from the wall, he is unconscious but breathing a.. Call an ambulance, the four wheel and cars are not ready to stop.and weight for the ambulance.... No over bleeding is take place.. But i know he is in serious and no way to survive.... He dead... And i witnessed it.