That's very sad news. Horses will be horses and it's amazing what they can do out in the pasture and get into trouble. It's a great pity that it happened at such a young age, all the potential.. just gone. My heart goes out to his owner.
I remember a couple of years ago, I arrived at the barn to see Annapolis flat out on his side under the trees and Star hovering over him. My heart was in my mouth as I walked over to check on him. As I approached, he raised his head and looked at me and then lurched to his feet. I have never been so relieved.