Here is another video from another guy that walked up on it.
At 11 seconds in the video you can see the muzzle flash that matches up with the gun sound. At about the same lower level.
https://www.facebook.com/doner.krookz/videos/1496729880382703/
I wish some of the Freepers with the right experience would chime in, because I know there are plenty of them here. From my very limited experience: (1) That does not sound like 5.56, but something a little bigger. It does not have the “crack” sound of 5.56, but I could be wrong. (2) The rate of fire seems to vary. Can automatic weapons do that? Maybe it is sonics or reverberation making it seem like that, Otherwise, it would be some type of bump fire arrangement. (3) If it is automatic, what type of weapon sounds like that?
Ok, I watched this one three times and didn’t ever see a flash-—anywhere. Why no flashes at 32nd floor????
But certainly in this one I saw nothing at the 6th floor.
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Wouldn't "match up" if real....about a half second sound delay at 150 yards...almost 1 sec. at the 350 yards from the shooter to the stage.
Also no broken windows on the lower floors..."2nd shooter" is on the the window washing scaffold or something?!?!? "Occam's Razor" applies.