[Paladin2]

Well, if bolted down well, one person could simultaneously shoot two guns. Pics from room don’t support that. Three simultaneous bursts would support, but there apparently are none of those.

FBI needs to explain sound track.

[Steve Van Doorn]

Not in this case. The second shooter was likely near the parking lot on the opposite side of the concert area.

Here is more analysis.
https://www.youtube.com/watch?v=JxmEFeKy8aI