CNN just played audiotape that make it clear the police knew that kids

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50. Wonder if the classroom had windows?

If so some cops could've began breaking windows to distract the killers attention from just the door and the kids. They'd use a loudspeaker of course to advise the kids to get away from the windows.

This would also distract the killer.
If no windows, what about the hallway walls? If they're just sheetrock, the custodian could have an axe for chopping through which would also distract the gunman.

All of the diversionary stuff would be to get in any possible way, or make the killer thinks so. And as it turned out the Border Patrol SWAT team didn't have to do any of that, they just got the key from the custodian.

All the other cops just cowered in the hallway doing nothing but listening to the killer shooting the kids. Nobody was thinking until SWAT got there, and even they were told just stand there at first before they said forget this, who's got the key?

The incident commander nor anyone else apparently thought of the most obvious thing.

Sheer incompetence.