Unlike the others this was a 'tranny antifa loser, bring your own gun protocol, we won't shoot you until you get your rounds off.'
Here’s what I want to know:
How did the shooter know that that particular roof would be empty and that he would be hard for counter snipers to see as he crawled into position?
He was a pretty perfect distance to pull off that shot. So he only had a limited number of buildings to choose from. He brought a ladder, so being on a rooftop was pre-planned.