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"I’m not sure about the ‘blown open door’ part, because as a rule of thumb you wouldn’t use an explosive for a breach. Usually it’s a ram or a halligan or just brute force."

I don't think they used explosives either. That would take some material htey don't have and to be properly applied. The door was chained though, was a fire door of substantial strength and the bar openers are substantial. Busting that door open would have been very loud. They may have had to use a vehicle. I just used, blown open in a generic sence. Certainly a flash bang could not blow open the door, unless they could "tamp" it with something. That something would probably look like a vehicle, so why not just drive though.

Since you saw the video and the rush, and didn't note anything about the breech, maybe a bunch of the did a coordinated hit on the door. The door breaking and lever ripping out would have been quite loud. ANother concern is that the mic only has a certain amplitude limit, so even though a gunshot in the hallway is painfully loud, it would be recorded that way. It would just be the recording of a max amplitude response at the gunshot frequency, which would be higher than that of the door popping. The door popping could also be recorded at the max amplitude the device is capable of.