Watched this point release/wet slab/glide come down at 11:15 off the Porter Slabs ascending the summer trail in Main Porter. Sun was heating the slope, looked like a bit of cornice broke/melted off as the point release which entrained snow causing a wet slab to release casuing the slope below to break/glide on the rocks. Technically, even though the slab "glided" off the rock face, it might not be a glide as it was casused by the snow above.

Ran 500 vertical, fanning out 150 feet wide at the bottom, 3 foot sidewall on the rock. Debris pile was 4 feet at its deepest.