The fight comprises of ripsnarl dissapearing every 25% of his health, and adds attacking the group. If you tank him behind the hut in which cookie appears, at the back of the ship, you LOS the adds, and get breaks during combat where the healer can regen.
Also, if on Vanessa Van Cleef if you die to the nightmare images, just teleport back and the fight will continue, if the nightmare elixir runs out simply go to the ship and she will be there waiting for the final phase.