Whats wrong with telling passengers to pay attention to people sitting next to them and around them for suspicious conduct.If some one is a terrorist who better is able to handle it than people sitting around you?
The policy of "let the flight crew handle it" is what got the people killed on 9/11.
Good job of doing what they were trained to do. Too bad these aircraft can not be equipped with VIDEO DATA RECORDERS to document this type of occurance for other training purposes, and film several areas of the aircraft to see what happened and effect a fix.