Are you sure this isn't just a video of a regular Tuesday in some of America's biggest cities?
Tree wells are absolutely terrifying. That dude just won the life lottery there, as they were not skiing together, and the skier just happened to be on the same line that the buried boarder was on. Nationally, tree wells kill as many people as avalanches. Luckily, the US has a very good record on avalanche deaths, when compared to the rest of the world, where avalanches occur.