Most control rooms were set up with positive purge systems so you went there to shelter in place and the positive pressure kept the nasty stuff out since the intake was usually 50-100' off of the ground and had monitors on it.
Oh and I did not get offended by no means.
The shelter in place for a fire arm intrusion is pure male bovine scat especially when you are unarmed unless there is a way to keep the bad guy out like a safe room where the "shelter in place" happens. But to just sit in your chair and hope the guy with the weapon does not show up is pure JCS crap.
I see...I now understand your earlier response to me!