I did some reference to ak47 and M15 bullet travel. If google is used to measure distance from Mandalay to center of the concert, it came out to 1,265 feet. The bullet range for both rifles is 500 yards or 1,500 feet. So the bullets are pretty much at the end of their effective range.
The measurement from Mandalay to the fuel depot is 2,144 feet. This would have to have a closer shooter to the fuel depot or a larger caliber bullet fired, that travels farther from the Mandalay roof cover.
This whole story is upside down the rabbit hole.
Gigas, the Occult networked mind formally known as Gigatron