Observed. Sledders trigger avi.

Suspected size 2. Crown 4-5 feet. -Sledder siding hilling above cliffs triggered a slide in the centre of the cliff band. -One person went for a ride over the cliff and pulled air bag -the rest of the group was at the bottom of the slope filming and was partially taken out by the slide, ended up loosing camera gear etc and had to uncover multiple sleds. -suspected injuries but no additional help was needed.