I believe you’re thinking of a video of a strobe flashing in a reflection on a window. I’ve watched every bit of the live video, at least once, and never saw muzzle flash.
No, it was plainly muzzle flashes from the 32nd floor. As I said they had it circled and it was in the right location.
I was the first on here to expose the strobe light issue. Everybody was claiming it was a 2nd shooter and it was plainly not, it was a strobe light. Videos before and after the shooting show it still flashing.