This is when someone is Driven to Suicide and someone else who is aware of their plans decides to actively stop them... by talking them down. Distinct from Interrupted Suicide, but sometimes part of one. If Bob has not gotten the opportunity to interrupt Alice's suicide attempt to request that she not kill herself, maybe she's called him on the phone to say goodbye and he's decided to talk her out of doing the deed rather than go along with her goodbyes. Maybe Bob has told Alice that he plans to kill himself several hours later and Alice, instead of immediately calling 911, is going to take a direct approach towards saving Bob's life. To sum it up, someone has decided, for one or more reasons, that they want to take their own life and someone else has decided to actively confront them and