Same thing happened to me on approach one time albeit we had come visual. Suddenly ILS flags came up. The F/O had decided to retune the ILS frequencies to VOR. Very distracting as I was flying the Glide path not the VASI. A simple do you mind if I reset the frequencies would have been nice.
As far as the axe man goes having flown with a few Samoans in the past it does not surprise me one bit. Sometimes a Tad emotional and prone to rash reactions. Generally good value tho'