They were two different guns.
https://peakprosperity.com/audio-analysis-raises-troubling-questions/
The acoustics are very clear on that point.
Well, it’s not clear at all that there was an ESU sniper at all. The report is that that the two ESU members who were in that room took a picture of Crooks acting suspiciously, and then went down to help find him, so weren’t up in that room at all at the time.
Of course that would take some to the next conspiracy.