Skinned up the Flagstaff ridge and noticed obvious signs of wind loading over the ridge including shooting cracks, whoomph noises, and wind drifted snow. Skied down the Flagstaff face and a skier unintentionally traveled too far skiers right towards the ridge near the start of the flagstaff gully. This triggered a wind slab to break loose from loaded snow over the edge of the gully. 300 ft wide, 10 ft long, d2. The entire slope broke with the slide. The skier was carried for 3 ft before stopping and not fully buried.