Tail wagging the dog
Er - ground staff (ie security with their qualifications) telling the Captain of an aircraft what he needs to do his job. Hey guys get a life. I am sure the ANO lays down what is required by law in the cockpit. Apart from that if you the crew wanted to do some serious injury I seem to remember (they made a film about this unless that is outlawed now) that pointing the nose at the ground and trying to break the sound barrier makes a big hole.
In view of the present threat it would appear that the flight deck should not be allowed on the aircraft. The plane does not fly and everyone is safe. That is until a catering truck runs into it.