I've heard the "you're not dead until you're warm and dead" saying before, but this is still amazing. Hopefully we can keep saving more people.
they spotted the top of Newman’s head sticking out of a tree well
This sounds like a spruce trap, though I wish they'd explained it a bit more. A spruce trap is snow buildup on the branches of a tree such that it looks even with the rest of the snow. But in reality there is a lot of air, and a person's weight causes the whole thing to collapse and suck the person in. I understand they're very difficult to get out of.