Austin Plane Crash - How Did So Many People Escape?

I've watched the coverage of the plane crash into Austin's Eschelon One building today, and marveled that the reports of death and injury were not being reported every minute or so. How did so many people escape this terrible event?

This FOX-Austin site says the plane hit in an empty break room. Evacuations began immediately. Police and fire arrived within minutes, and the building occupants apparently were well-prepared for an emergency evacuation from their large seven-story facility.

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