Originally Posted by Fraport

Be mindful that a complete psychotic episode is also a medical issue. It would not be unrealistic to have a person with unfounded psychiatric issues (depression not included, I am talking about full on psychosis), suddenly faced with a moment of isolation when is coworker leaves, to suddenly have such an episode trigger.

This is a hypothetical situation where having the two person cockpit rule would help. Anyone who has ever experienced any sort of sudden psychotic episode, panic attack, blackout in which they do something inexplicable......occur in either themselves or a loved one - its not so far fetched. That type of situation is not considered malicious, its a switch in the brain that suddenly short circuits.