Notifying the Air Force is not the same thing as "calling 9-1-1" because your own employee on your own radio is telling you to call the cops because you got shot by someone with a rifle on the 32nd floor.
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If this had been a fight at the betting tables, how fast do you think security guards would have been there? With hundreds of thousands of dollars in chips in the area? Real fast. 
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A security guard got shot. He supposedly radioed he got shot and to call the cops. And we have a six minute delay between when (1) the guard was shot and (2) the Shooter started shooting at the crowd. "Who was doing what" or "who was not doing what" during those 6 minutes is "unexplained."
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There may be logical and reasonable explanations, But, so far, the cops are blaming the Casino and the Casino isn't explaining much such as (1) how quickly did they call 9-1-1 and (2) if they sent any "armed help" to the 32nd floor?