Hey, thanks to whoever pinned this.

GLP.
Check this video out.
Listen very carefully at the 14 sec mark when the gun fires off a couple rounds. I SWEAR you can hear the ejected shells hit the ground.
I have listened over and over.
Either the shooter is close to whoever recorded this vid OR the mic was close to the shooter and its coming through the sound system.



Also, I believe the person in charge of the stage lights was involved in this event. Notice in all the videos from inside the concert area the spot lights are turned to bright and aimed directly on the crowd. Like shooting fish in a barrel.

Also, listen (very clear with headphones) at the 1:30 mark. You can distinctly hear either 2 separate guns or one gun being broadcast over the pa system!