How can one use diplomacy to help someone in pain?

I find that asking a direct question is the best way.

“How can I help?”

Right. I would ask them. But know that the answer may be that there is nothing you can do. Sometimes people have to decide for themselves.

Get more detail, then consider what to do.
Do you have any more detail ? @talljasperman

@lloydbird Yes. The person was tricked into assisting in his grandfathers suicide 18 years ago and was heckled by his family over his grandfathers corpse in a hospital about being worthless for not being able to earn money. The man who was 17 at the time vowed that he would bring his grandfather justice or destroy himself trying. Instead he ran away from home and never came back and never moved on. He belives that something more was happening and that no one belives him. He seems to spend large amounts of time researching mysticism, time travel and first aid. He doesn’t work for very long at one location.

@talljasperman Heavy duty!.

Can you please elaborate?

@lloydbird No. I don’t have much else other than the guy was watching a Spider-man cartoon in 1995 in which Peter Parker destroys the universe. The man becomes emotional whenever he is removed from a television set and keeps insisting on finding similar stories in fiction.

Withdrawn answer. By me,.

@lloydbird Yes. The other details mostly fall into esoteric delusional rants and observations.

@talljasperman So what kind of help is needed?

@lloydbird The man is requesting assisted suicide, before he becomes a greater danger to others.

@talljasperman Heavier duty!
More detail….?

@lloydbird The man thinks that he is Peter Parker and thinks he is possessed by an evil power like the Carnage Symbiote, and Is looking for an end to his torment by acting out the last episodes of the Spider man episode, In which Spider-Carnage destroys the universe. The man hopes to talk to his grandfather one last time to see if his grandpa forgives him.

@talljasperman And what relation to you is he?

@lloydbird The 17 year old grandson… was the grandfathers, son’s, son. My relation is that I am the good Peter Parker who is trying to time travel and help the other one who calls himself Spider-Carnage have peace.

@talljasperman I see. Well. I feel as though I must consider my next post. And wait and see what others might have to say on this matter.
You could put some more flesh on the bones of your tale if you wish though.