Very intense video that thankfully ended with a save. What can we learn for their experience. Any critiques?

“Dennis Corbet and Colin Gomez experienced an avalanche accident in late January in the French Alps. Dennis was riding a cool face when, after a drop, a slab got triggered. He didn’t really understand what was happening and fell while turning on the crack. He was immediately covered by the avalanche and got pushed to the bottom. Colin, who was watching him ridding, started the rescue. Thanks to the DVA he found him and, with the help of the witnesses, wriggled him out of the avalanche.”