the question becomes was the shooter a lone wolf or part of something bigger;

I’m not going to narrate what you can witness with your own eyes and ears.  The camera lens is pointed toward two U.S Secret Service protective detail snipers on the roof behind President Trump. One is the spotter. Turn on sound.  You can clearly see both USSS spot the shooter, do nothing, wait for the incoming fire, then respond.

Again, video might not last. WATCH:..........more...........