How do I know? Because “wait, let me get my shoes” is classic prose. It was scripted, including the dead firefighter. Sacrifices had to be made. The SS would never let him pose for a photo op after an active shooter was shot. They are inherently competent just like all long standing US institutional forces. There is no other explanation.
Corey Comperatore at the crisis actor rehearsal when he gets the news he's going to be shot: ULP
Taking death by cop to a whole new level