Originally Posted by sprucegoose
We also used to teach CC to shut down engines if they were running and FC were incapacitated.
I do assume that this was in the days before the installation of the armoured flight deck door. As it is now, this is a serious obstacle not only for bad guys, but also for cabin crew with the understandable desire to kill the engines for an evacuation. Such an attempt will seriously cut short the time available for an evacuation.
So the choice is either to use time to ensure the engines are dead while the cabin becomes more and more inhospitable or to accept the uncertainty about the engines state and get those passengers out of the cabin.
Accepting the more or less remote possibility of an engine still running and therefore giving the evacuees orders to leave the individual exit into an appropriate direction away from the engines is certainly not a perfect option either but IMHO more likely to result in the desired outcome: to get the passengers out and clear of the aircraft as quickly as possible.