I don’t doubt that there was confusion, fear and the fog of the battle going on. However, I was watching it live streamed on Twitch, and when the crowd gathered outside a door, the police were there. I did not see anyone attacking them, although the crowd was thick and probably pushing forward, but still everything was static. Suddenly, the door is opened somehow. Not sure how that happened, but observing what the streamer saw, it wasn’t a bunch of crazy people smashing things or running. It appeared to be men and women walking the halls, seeming a little incredulous that they had been given access. I didn’t see anyone breaching any barriers, although several got into the empty chamber somehow. I didn’t see anything that indicated the need for lethal force, and in fact some armed uniformed officers in riot gear seemed to be in stand down while others escorted people out - at least that’s the impressions I had from watching it streamed from the crowd. For these type of events, twitch.tv is a good source with a collection of citizen journalists feeding from the scene.
We will never know the truth.
The part where they yell “Break it Down!!!” was probably the turning point.
Those men inside have limited view and see only what’s in front of them.