Ok, I stepped thru frame by frame. Shots 1,2,3 the cameraman dude is running, each frame is sky, or trees, or the ground. Shots 4,5,6,7,8 the camera is actually facing the building, but there is no flash coming from the window. Shot 9 (actually 10, since Shot 9 is not heard in this clip) the camera is pointed towards the sky and trees. No muzzle flash in the windows unless I missed something big here.

Ok, I stepped thru frame by frame. Shots 1,2,3 the cameraman dude is running, each frame is sky, or trees, or the ground. Shots 4,5,6,7,8 the camera is actually facing the building, but there is no flash coming from the window. Shot 9 (actually 10, since Shot 9 is not heard in this clip) the camera is pointed towards the sky and trees. No muzzle flash can be seen in the windows unless I missed something big here.