In fairness, guy on the phone was checking for a message from his wife. She was a teacher in the school who had previously contacted him to say she had been shot. He ended up disarmed and removed from the scene.
But yeah- those at or near the front were fucking useless, and should all turn in their badges. Kids dying? You go in, full stop. No shots for a few minutes just means some are still bleeding out.
Anyone more than a tactical bound behind the front element I can understand not moving. They would have been in an information vacuum, trusting those farther ahead to have a correct read on the situation. Nobody would assume a foul up this monumental.
What I want to know is who was the initial critical incident commander? Someone in the first two minutes should have been loud on the air declaring him or orderly the MFIC, and making decisions that make sense. With people dying, that would include saying “form a stack and stop the threat, and good luck, the whole world will be only two steps behind you”.
Either someone DID step up, and failed, or no one stepped up, and so the whole department failed. I mean, obviously the whole department failed anyway, but that would be the first and most critical fail point.