Bhawkes – You didn’t say it, but I think from what you have written the young man committed suicide.
Even if that isn’t so, the fact that he asked you to experience his pain, and you told him his death could have been prevented, suggests he was in a depressed state when he died.
From what I gathered from all that, I feel that what you did was probably a step in his healing; that he punched you shows how he released anger and then dropped back into a lifeless condition, says as much.
If he died through depression or worse, he must have felt that death would release him from his condition. So he would take on a pose of death – and of course could easily sit up again when needed. I would suggest that you sit quietly and talk to him, explaining about a different way he could be. Say something like, “As you can see, death doesn’t remove you from experiencing your mood and what you create with it. You can move on from this false death, by asking those who love you to help you. Think of a good time in your life and see what it does.”
Tony