I dont want to take anything away from the serious need to keep concussions to a minimum.. but there was likely something else going on in this kid's head besides just recently having his bell rung.
Sometimes people, young men especially, bottle up depression and guilt because they don't know how to properly process those feelings or don't realize that maybe medication or counseling could go a long way to help.
It's not easy being a young man.. everyone has such high expectations and all you want to do is make your family proud.
This is just a shame all the way around. I really wish someone that understands could have been a crutch for him to lean on.