In reply to Tom Row: I'm going to stick my head above the parapet and say that I tend to agree with you. It's one of the reasons why you wear a helmet in winter: to give yourself something to "hide" under as best you can if lumps of hard stuff start falling on you.
I can't help wondering, given that the casualty's first reaction on finally coming to rest was to check his helmet camera, whether it was concern for the camera that prompted him to try to bat the falling ice away, rather then hunkering down and relying on his helmet to provide some protection. In a choice between a shattered hand vs a dented helmet, I know which one I
hope I'd opt for in those few seconds (by which I mean it's always easy to be wise after the event, and in his position I cannot possibly be certain that I'd have done the right thing).
Taken as a whole, it does seem to be a good example of what divers call "The Incident Pit": a sequence of what might appear outwardly to be insignificant choices or minor errors which, when added up, result in unhappy consequences (fortunately not too unhappy in this instance - but even that was more down to luck, it could have turned out much worse). Divers share these kinds of narratives in order to learn from them and, hopefully, avoid going down similar paths. I think climbers could do well to adopt a similar approach, rather than the: "Wow, close one, good on you for having a go!" reaction which some people seem to think is appropriate. Maybe that kind of response is a way of expressing relief that the people involved ended up more or less OK - which is in itself understandable - but not if it gets in the way of analysing why things happened in a rational way with a view to avoiding them happening again.