AIR PIRACY FOR DUMMIES
Step 1. If you suspect that there might be covert armed guards aboard, one of your party should flush them out by behaving in a manner guaranteed to do that. There will not be more than 2, for financial reasons.
Step 2. Another member of your party helps the flusher to neutralise the guards who have now identified themselves.
Step 3. All members now carry on with the action, free of interference.
It's not a new idea; it was practised in the 1970's in the Middle East. That's why armed guards are/should be taught not to interfere in or respond to disruptive passenger situations.
As for the CC identifying them by calling for help...words fail me. That's why they should NOT be known to the CC.
But of course awareness of history is a no-no for today's gung-ho leaders.
As with Afghanistan.