The Legend of Zelda: Skyward Sword Cheats :
Secret - An easier way to beat the Imprisoned
The first time you face The Imprisoned may seem frightening to you, but really, there's nothing to be afraid of. Anyways, the easier method is to go to the hole where it shoots out strong gust of wind. Once you are just about a platform higher than The Imprisoned, jump on over to his head and press the B button to safely land on its head. You will now have the advantage and vertically slash the stone on its head. You can do it about 2-3 times in the first round.
This method does work for round 2 and 3, but on the third round, you won't able to use the method I explained, so you will have to use Groose's Groosenator and launch yourself towards The Imprisoned's head.
That's all there is to it. Don't worry if The Imprisoned is about to go near the temple on round 3. You will be given some amount of time before it gets near it, so be sure to dash on over to Groose before... you know what happens next.
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