He TRIGGERED the avalanche??? REALLY?
I think they mean he triggered it accidentally by skiing. But avalanche professionals frequently trigger them intentionally. Far better to get the risky snow into avalanche before the ski resort opens and it endangers people. There’s a movie about the avalanche at Squaw Valley in the 90s showing the growing avalanche danger, avalanche patrols at work, and how eventually many cornices let go at once killing several people.