What exactly does "healing damage" refer to for Unquenchable Flames and Shroud of Silent Mist's *Slow and Silent Death*?

What exactly does "healing damage" refer to for Unquenchable Flames and Shroud of Silent Mist's Slow and Silent Death?

Damage healing during Time Passes (and any future effects that use the word "heal").
It does not affect damage being cleared when an Invader or Dahan is saved from destruction.