It appears that a skier caught air and landed on a steep convexity initiating the slide. Resulting debris was sizable enough to knock someone off their feet.
Did not access the slides and are unsure of the failure plane. They probably initiated within this weeks storm snow and eventually entrained all of the snow above last weekends sun crust.
Forecast Hotline: 406.257.8402
Call or text an observation: 406.66AVYOB