Do have a specific time-stamp in the video? It’s 6-minutes long and comprised of scores of different clips.
When you’re watching the clips that were produced by body-cams, those clips were more likely to record richer ambient noise because that’s one of the design features of body cams. Body-cams are designed to record what’s going on around the wearer.
The audio clips probably were taken with varying two-way radios. The mics in com gear is less likely to pic up and transmit ambient noise because ambient noise is the enemy of clear communication.
To the extent that you can hear echoing in the background?
BTW, the rioter’s radio when he was talking about the gallows also had that wonderful background noise suppressant to the extent it had the same echoing effect.