Is the answer the fight between you, Pete and Pete in the Timeless River?

Azure flashes and flutters,
After the unaged creek's been restored. - The Timeless river
Mind over body, - Sora's mind Vs. Pete's bulk perhaps?
Arms over fists, - Sora's arms Vs. Pete's fists...
Speed over height. - Again, Sora's speed Vs. Pete's height.