You cant blaim urself for the actions of ur friends, Although It is very hard not to. The only thing u can do right now is be there. Stop thinkin about the worst that can happen and start thinkin the best. Sometimes the encouragement of another can help bring someone back from the brink of death. So stay with him, keep talkin to him, and remind him of how things were when u were young. Keep everything hopeful when u talk to him even if he is unconcious. Good Luck sweety and my thoughts are with u.