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Courtney can be a challenging boss if you are unprepared. For the first part of the battle, Courtney attacks from the cages, firing energy discs and summoning her backup dancers to attack Ratchet with spinning kicks. The Nitro Eruptor deals decent damage to her, and the Plasma Whip can be used to get rid of the backup dancers. Once she's at half her health, she'll fight Ratchet directly, attacking with energy blasts and spinning kicks. Just avoid her attacks and fire at her until she is defeated.