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The video (above) you are watching is a "zoomed in" version of this video:
https://www.youtube.com/watch?v=BPQxaERCxaM
If you think this video shows the wrong side of the Mandalay Bay, or I've dubbed the gunfire over an old video, you're wrong. You can watch the original video I used to zoom in and create this videos here:
https://www.youtube.com/watch?v=BPQxaERCxaM
This video was filmed during the Las Vegas shootings on October 1, 2017 from outside of the Route 91 Harvest Festival Gate 2B of the Las Vegas Village, which is on S. Las Vegas Blvd, north of Mandalay Bay Road (across from Luxor). It also includes a super slow motion replay, slowed down to 12.5% of normal speed - with sound.
It shows the outside of the entire corner suite of the Las Vegas shooter while he was shooting. The rapid fire shots are heard, but no muzzle flash is seen.
My theory for why we don't see muzzle flash is because when this video was being filmed, the shooter was using the window in the front of the suite, not on the corner. If my estimations are correct, the broken out front window is between the 3rd and 4th vertical light (from right to left), and right where the reflection of the white lettering is going at a diagonal across the front.
For those who can't understand why I don't have the circles you see in the thumbnail included in the video, I don't have the software that enables me to place circles in one location while the camera moves around. I made the circles on the thumbnail in hopes that a reasonably intelligent person could figure out where to look on the video.