This is the link to the video.
https://www.youtube.com/watch?v=zcInG9iz-UU&feature=youtu.be&app=desktop
from the youtube video comments:
Yeshuah is King of Kings
39 minutes ago
Incorrect. It’s a police officer with a flashlight looking for the gunman, they didn’t know where it was coming from yet. Shortly after the purported shooting by him you can see him come past after the guy in cowboy hat. More interesting is that no muzzle flash is seen from the upper Mandalay Bay right wing windows