Super necro post but i just did this dungeon a few times on my recent raf team. Typical dungeon killers, pally priest mage x3. I just face the dragon away from the tram who are parked by the bridge and use my pally to face the dragon away. He takes the fire damage as i heal him through it easy enough, then the little pots of fire on the ground targeted at my group is easily sidestepped and heal any damage taken.