Great video, thanks for posting, @roamer_1
But I must take issue with the premise that the shooter was on that particular roof. If you examine closely, you will see that the roof in question has a slope to it, which apparently is an extremely rare occurrence with roofs. Thus, it would be impossible for someone with a rifle to lie prone on it.

Now, I am hearing 4 overwatch nests. 2 SS, and 2 SWAT or other agency.
It was not the northern nest that took the shot (the guys in ballcaps with 'Police' markings) - Their view was obstructed by the westernmost tree. It was the southern team, behind them (the guys in the Jungle hats with unidentified markings), firing past the northern team, that took the shot.
Response was one shot (the last one heard, which I find remarkable) from a 300 winmag.
I would think a 300 win would burp a little louder than a .223 130 yards away....
Maybe they were suppressed and not firing winmag