He'll probably need counseling -- I can't imagine having to deal with something like that at 10 years old.
A guy I knew when I was a kid accidentally shot and killed his little brother on a hunting trip. YEARS later, Roger was still not the same, he never got back to normal. He seemed to be in shock the rest of his life, his eyes retained that glassy stare. But there wasn't a lot of therapy our counseling back then.