The question is a fair question. It's a wonderful question. The fact that the cockpit doors should stay locked is not disputable.
The protocols should be such that any threat that happens before the doors shouldn't enable a stewardess or any member of the crew to open the doors. If it is as such, I don't know, because we are not involved in that. We might have an opinion in saying that there should be a protocol. The inflight security measures are the sole responsibility of the airline that operates the inflight process, not the security company or the security regime that does the security for the passengers before they board.
Having said that--