 I've been to a lot of presidential-level events. Usually all windows, balconies, parking garages, roofs with line of sight to stage are covered. How was this perched not? And a spectator says he told police about seeing the guy. He was ignored. The Overwatch sniper team should not need to wait on approval to do their freaking job and neutralize a threat. The rooftop had line of sight and wasn't covered. That was an abysmal failure.