[Alberta's Child]

The "muzzle flash" has been debunked already. It was a strobe light of some kind -- probably set off when the smoke alarms in the hotel room were triggered by the ammunition smoking off.

The distinctive sounds of two different guns firing (one much closer to the car where the video was taken) is definitely intriguing, though. I've speculated that someone at or near ground level (security, police, civilian) may have actually been returning fire against the guy on the 32nd floor.

[going hot]

if there was indeed shooting from two different windows facing in two directions...

Sometimes the sound from the barrel bounces off nearby flat objects and the barrel sound as well as the bounced off sounds reach the ear at close to the same time, thus sounding louder and closer.

Other times, the primary sound might impact off flat surfaces and dissipate more before reaching the ear, thus sounding weaker, thus further away, so a small change in location can in fact fool the listener into thinking there are much closer or much farther than actual.

[LS]

Except the sound of the “returning fire” synchs perfectly with the strobe. And this has NOT been “debunked.” You can see other videos of the strobe. It goes Flash. Flash. Flash. Regular, steady.

This video is very clearly a flashflashflash . . . flashflash . . . flashflashflash ALL perfectly synched to gunfire sounds. No, this ain’t no strobe.

Now that we have evidence of Paddock supposedly shooting at the fuel tanks, a second shooter makes all the more sense: closer, larger cal weapon. Paddock’s job was to drive people toward the tanks. #2 to ignite them.

[SteveH]

In the videos it sounded to me like echos of the original sound of a single weapon firing. The echos often if not always seemed to me to die off about 1/2 second after the louder weapon firing sound. At the speed of sound (~767 ft/s) that could be a reflected sound path ~383 ft longer than the primary source aimed halfway between the sound source and the sound receptor, something as easy as a nearby flat vertical building surface, or even an evening temperature inversion layer in the air.

[sargon]

Regarding "2 sets of gunfire sounds", an ex-soldier said on FR earlier that you have the sound coming from the source of the firing—the report of the rifle—and you also have sounds as the supersonic bullets arrive and impact with various materials, causing "cracks" which are heard "instantly" (because the sound doesn't have to travel anywhere, essentially).

That alone can lead to "2 sets of gunfire sounds", so such observations aren't as cut-and-dried as one might think.

I'm no ex-soldier, but it does make perfect sense that you'd have 1) the report from the gun at a significant distance which takes some time to reach the target—certainly slower than the bullets—and 2) the "local" sounds the bullets make as they impact concrete and other dense materials in the target area. Viola! 2 sets of gunfire sounds.

Just my 2 cents' worth...