The player should cast Regen on Rinoa at the start of the battle, followed by Shell. The player can draw Regen from Rinoa for this purpose. Adel will frequently drain HP from Rinoa, so the player should make sure one of the fighters has the Recover command to top her up occasionally. The player can also mug eight Megalixirs from her, but the player must be careful not to kill her in the process.
It is possible to devour Rinoa for a permanent increase of 10 HP, but it is pointless in that if she dies, it is Game Over.