Any film from overhead of the riot, and possibly the car zooming in, may have been burned in that helicopter crash. I read that they were filming the scene and feeding information back to the Wells Fargo command center.
I also saw a black guy on Facebook saying they all came in on matching busses, with people in KKK shirts and BLM shirts getting off the same bus.
I saw that about the buses. Seemed pretty sketchy - someone told him something but no photos or videos or even direct witnesses.
The overhead shot the police chopper would have had would explain its sudden fall from the sky.
The odd fact the eye witness and primary videographer of the attack is a political operative / former psy ops State Department guy sure was odd!