That's very interesting! I had no reason to believe a second shooter, but the audio doesn't lie. ~Someone will need to explain it away better than this guy.~ Before I had just assumed the later shots were multiple counter-sniper rounds. They killed Crooks with one but that doesn't mean others didn't take shots.

Edit: I found a response thread from another analyst who convincingly dismisses both the second shooter and water tower theories. The gunshots on some videos sound different because of microphone direction, and the water tower doesn't have a line of site to the stage. u/Kienan u/evilplushie.