At this point, it is not clear that the pilot did in fact shut down the affected engine, but by emergency protocols, he may have to prevent further damage or a fire breaking out.  The source of the pronounced buffeting could be the result of  damage before engine shut down.  The cause of the engine failure is of great concern and hopefully Hawaiian Airlines, which flies the A330, is not the same dash-model equipped with the Rolls Royce engines.  I am flying them next week.  What is more puzzling, is that with the aircraft damaged and possibly one engine shut down (an emergency situation), why did they return to Perth, at considerable distance and time?  Was there not any airport that can accommodate the aircraft in an emergency closer than Perth and why was that not chosen?  The pilot asking passengers to pray, unfortunately did not instill confidence in some passengers and will probably be reviewed by management.  I did see the video and the shaking was considerable.