When my ex used to threaten sui, my T said that the chances are more likely if he knows he has a sympathetic ear.

Last night in group, a woman was talking about sui, and my T did not even react. Towards the end of the session, my T explained that if he felt that she was serious or that it was a recurring thing, he would've stepped in.

I would think it would be hard to differentiate between someone being serious versus someone expressing sui as a cry of pain or hurt or wanting attention....I wouldn't want to be in a T's shoes to have to make that determination, that's for sure.