You see the Trait whenever you drop below 30%, which happens plenty of time in any halfway challenging activity.
Dropping below 30% does not neccesarily mean you'll die.
It's just that it heals for such a low amount that you never notice it, similiar to the dmg reduce from the MM trait.
Healing Surge consumed Maelstrom during Alpha, was later removed because people hated it to use their resource for defense.