You do what you do anywhere else while avoiding death.

I generally begin with Virus, then Thunder III --> Fire III ---> Fire fire fire Blizzard III. I tend to save Raging Strikes for the rocks. By the time the heart is up I have Virus again and use it and work in some Swiftcast Flare. Since there is a lot of running around I fill in with Scathe while on the move. I only hit Transpose if its a "stack on the tank" moment.