Incredible! @28 sec, it looks like they just barely stopped loading the chair about 10 seconds before it hit.
I guess noone got hurt (?). So lucky that the lift cable did not come off the bullwheel; and the bullwheel brake worked; having the lift run backwards uncontrolled is a worst case scenario for anyone on the lift.
Big wet slides are like moving wet concrete. In the early 80s there was a big wet slide off of Flagstaff in Alta that demolished a couple buildings off their foundations. Then it hit the road, rolled right up to some plate glass windows at the top of the Alta Lodge, then squirted down the road to the right and did not break the windows. Witnesses said you could out-walk it down the road it was going so slowly.
Searching around about this avy turned up a huge powder slide vid I have not seen before: