Shooter incident at elementary school in Uvalde, Texas - 19 children and 2 adults dead

I taught Active Shooter Response. We broke it down to just two officers on scene and responding to an incident. Two officers could of taken that punk shooter. That clown had no training and whatnot, but regardless, the officers just stood around and didn't try until they had what I'm guessing they felt was overwhelming force. Eff that stupid School District Chief. If it came to that, I'm turning my radio off and saying I didn't get the memo.
Didn't they not have the key for the room or something? Or am I misremembering the details...