Whenever I'm hanging out on a chairlift I like to shout that I'm going to go die a cold, snowy death. Mostly so that if I were to actually perish on the ride down I could say, "I told you so." But also because I am genuinely (and in my case, irrationally) afraid that something terrible like this will happen. The guy in the video is an experienced backcountry skier named Chris Cardello. In his words:
When the slide propagated, I tried to remain as composed as possible and make sure my AvaLung was in. As I was getting buried and the slide slowed, I threw one hand up and with my other hand I grasped the AvaLung, which had been ripped out of my mouth during the turbulent ride. While I was buried, I tried to be as calm as possible; I knew my hand was exposed so my crew would be digging me out shortly. I was able to breathe through the AvaLung, but it was difficult due to the snow jammed down my throat.