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Ressources for unkown person having dark thoughts
(self.Help_Others)
There are many helplines for mental health, try and figure out where they are situated and provide them with the number to call. Ensure to be non-judgmental in the way you make contact, and don't push it onto them if they don't want/seek to help themselves (they might further shut themselves in).
The first step is always to realize it's a problem, and that will only happen when they feel safe enough to look at themselves as someone who "doesn't need to be strong" and tackle life alone.
It's difficult to know concretely what approach will be the most successful, and how to not be considered a potential threat by them, but I recommend the general kind approach: No judgment, a caring voluntary offer, and no obligations or time pressure.
I'm no professional, but I've had some events in my life. I hope this helps!