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. And from the way it appeared to be playing out, I don’t what use a flash-bang would be either. I think we’ll have to wait out the actual report to figure that out.
From the kid’s cell phone video, you can see all the deputies make a bee-line for the door all of a sudden, which would normally indicate there was no organized SWAT entry, because you generally get the uniforms out of the equation once SWAT gets involved. Very practical reason for that, the team members know what each other does and will do, not so with the uniforms.
That looked like sort of a cavalry charge to me, which leads me to believe they didn’t spend a lot of time waiting around before they went in.
Well... we’ll have it all when the report’s filed.
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.