Kiwined - no need to be quite so defensive, if Air Zermat are doing what you say then they are doing exactly what I would expect from a professional outfit. They are analysing the reasons for the accident and working to ensure they can prevent it happening in the future. That may or may not involve rebriefing or retraining for the pilot involved..
Night mountain rescues are not exactly new to me and I am well aware how well trained you need to be to do them.