We all donīt know what he was doing....but lets face it:
Flying in the mountains at night (without night aid) is a big no-no......unless youīre flying a well known (and documented) route, or a known GPS-track...
It is pretty dark up there (depending upon the weather and the moon), and i canīt see why it was necessary to resupply a chalet at night anyway...
So this accident leaves a lot of ????......and people in general, but pilots especially like to come up with ideas based upon their own experience..
I doubt there are many pilots here who have high altitude/mountain experience in a helicopter.....
The accident investigation will show more....
Maybe he hit a cable?
Maybe he just had a CFIT?
Maybe another technical problem?
Maybe he had a vertigo?
Who knows.....
None of those will answer the question about risk assessment for this flight....