My son, a boarder, caught an edge after getting some air on the side of a trail at Keystone. He got chucked into the trees. He hit a tree in probably the best possible spot on his body, back of his left thigh. His entire leg was black and blue. No helmet, probably came a foot or two from serious injury or worse. Scared the shit out of him, and hasn't boarded since. It's been five years. He started on skis at 5, two years of that, then went to the dark side. So 20 yrs sliding on snow. I feel a little bad that he lives on a great place to board and no longer does. But I would've felt like shit if he had been seriously hurt or killed that day. I think I'd have felt responsible having introduced him to the sport. Luckily he's still enjoying the mountains hiking and hammock camping. I got him bear spray for Christmas, he's had several encounters with black bears.
Be careful out there, it is an inherently dangerous activity.