“I also appreciate the mention of policy across most of the U. S. regarding secure and wait for Swat.”
That is not the policy regarding active shooters anywhere in any US departments and hasn’t been for a solid decade. Police department SOPs are public documents in most states. I defy you to show me one from any department outside of Mayberry that still instructs officers responding to an active shooter to secure and wait for SWAT.
So you’ve got a bank with three shooters.
It’s your opinion that one guy should run marching in?
This deputy could not rule out there being more than one shooter.