We are grateful for ourthe community’s vigilance and empathy in watching out for each other.
Our official policy regarding suspicions of self-harm and suicidal users can be found at What are our policies regarding self-harm and suicide?. These types of circumstances can be difficult to manage and carry a lot of responsibility, and while we expect our users and moderators to report such incidents promptly, we do not expect anyone to feel obligated to engage further.
Users can raise a flag for moderation assistance under “in need of moderator intervention.”
Moderators can use the "Contact community team" option under "Actions" on the user's Mod menu.
Again, you are of no obligation to further engage a user who may be in crisis. However, if you do feel you would like to engage, we would strongly encourage you to read this answer by Rebecca that Tinkeringbell shared in the original question. It has useful information that could be helpful.