2 things, so I have no BC experience is this considered a slab avalanche? also when it slid it seemed to stop rather quickly, is this because the terrain was not as steep as some other avalanches i have seen?
Vibes to the skiers family RIP
Yes that is considered a slab avalanche. You can tell form the video that wind loading was still happening while they were filming. The runout didn't occur very long due to the pitch of the terrain so you are right in that aspect. The report says the slope was 36 degrees so right in the zone. If you want to get your nerd on there are more photos and another video of that slide.
Avalanche: Wolf Creek Pass 1/17/2012 | Utah Avalanche Center