What the he'll was the Captain doing in the cabin after a passenger had made a threat on his life, don't Jetstar have any procedures for this situation.
Let's take this a little further and say you've got one of these 200 hour cadets left in charge and a dead of unconscious Captain. God help the passengers!
No excuse this idiot was able to approach the Captain, what where the cabin crew doing, clearly thinking was not on their list. Will it take lives before people in power understand that experience and subsequent awareness of the entire crew is critical to safe flight? This is not and should not be treated as a fast food drive through with the cheapest dumbest staff you can hire.
Never were truer words spoken.