What's inefficient here is the tank not pulling more mobs. If a healer has time to be in cleric stance then there should be faster and larger pulls by the tank Especially if there's an Archer/Bard or Thaumaturge/Black Mage in the group. A healer is there to heal. That is it. If they have time to DPS then the run is moving too slowly. DPS should not be an issue in low level dungeons like Halatali."