Slide on avalanche crest - Jan 9 2009 from Tyler Wilkes on Vimeo.
The Dude can just flat out ride...
I see a few things right away on this situation.
All 3 skiers on the slope at once.
They didn't mention if they did any snow tests.
They hit that roll over on the skier right and that out cropping of rock on the skier left at the same time, both trigger points.
Could have made a ski cut to a safe zone to check the slope, to the skier left away from the trigger.