Some things to keep in mind as you view the video. There was only one "tornado warning" -- he was referring to siren activations.
Do not use the elevator in a tornado warning. Power could go out and you would be stuck. If the building is hit and the shaft bent, you could be trapped for a day or more!
There are several laggards when he makes the rounds a second time. Move to shelter immediately in a tornado warning!
Stay away from windows and glassed-in areas. This lady is in danger if debris flying at 200 mph comes through the window in the background.
Very smart! No one taking shelter in hallway with doors opening to the outside.
Also very smart. Taking shelter in an interior hallway. No windows.
This is a story of almost everything done correctly. Please view it as the 2013 tornado season has only just begun.