Mini slide above skin track to spearhead col

Skinning about 10m above the usual skin track going towards Spearhead col. A skier on our party set off and was caught in a size 1 (or less). avalanche It carried them about 15m down the slope. They stayed on top of the snow and were able to extricate themselves. The crown line was up to 30cm in the middle and around 10cm on the edge. Approx 10m wide and ran down about 30m. The crown line was about 5m above where the skier triggered it from.