Unusual Blood ties

Shadows don't have red eyes, nor do ghosts. That should have been my first, my only hint.
The water temple was hellish. No, not the volcano based fire temple, or even the illusion filled shadow temple came anywhere close to the trials faced beneath the waters' surface. I dread to retell the story of my untimely visit.
But there is one thing. I had assumed the room of illusions there was Gannon's doing. That he had cast the spell over the room, and created a shadowy version of me.
I can remember the fight like it was just yesterday; the way each touch of his chilled me to the bone, and the way his red eyes gleamed hatred and knocked me down.
Walking in there I felt like a hero doing his duty; and yet walking out I felt like a boy stripped of everything; a thief.
I dubbed him Dark Link, Just as Navi had done, and yet the name Dark doesn't fit the man I met in there that day. He shone brighter than the sacred golden light. I know there is more to his story than just a mindless minion, but how am I to figure it out?