Great video. The key window is the third from the left, by the air vent. This is the one that lines up with where Crooks died, toward Trump. I’ve noticed that this window changes in multiple ways before and after shots 1-3. Before shots 1-3, that window has red drape covering most of it but with a bit of black background at the bottom (as if the curtain were slightly lifted). More specifically:
4:16-17: Third window mostly covered by red curtain, but bottom 1/4 is lifted unevenly and in the middle there is a light slit around black background. Curtain has been lifted a bit. Is it a possible sniper?
A woman rides by with a horse and a big Trump flag. Unusual. The cameraman gets distracted by her, and pans his camera away from the windows, as would anyone who happened to be filming that area at that moment. (It almost looks as if the mounted woman with flag were timed to distract from what is about to happen).
At 4:47 the window is still all red, but at 4:50 it is all black! *
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Then at 4:54-56 the three shots go off.
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4:59-5:01: Blind is fully down and fully white rather than red or partially black at bottom.
5:04: Blind is up, can see light object inside, at moments long, at moments just a dot.
5:18: All black background
What to make of this key window’s changing colors? I did not manage to see any flashes, but someone else may have a better slow-motion video viewer.
6:44-7:05: Outside LEO points his rifle into a 1st floor AGR window, then joined by another, checking it seems all 1st floor windows
8:10-12: A bunch of LEOs go inside AGR
8:22 Bunch of PA State police cross fence toward AGR
8:41-51 Red haired suited (FBI?) crosses fence, is seen later in Grassley video 1 about 50 minutes later. He then pivots back to fence to help further LEOs to come in. He shows little urgency to get to crime scene on roof. But at 9:03-14 this suited red hair is very keen to get DJStew to stop recording.