The bird dropped me off where it originally picked me up, and the place looked exactly how I remembered it. Except there were a few more hollows now. And some of those knight guys. And the floor where I originally fought the fat demon to escape broke underneath me, making me fight ANOTHER fat demon. This one had no chance though as I was far too good now. I was a little sad that I had to slay Sir Estus, now a hostile hollow, but had no such feelings for the other knights who now patrolled the halls.
Here's your reward for helping me at the start...
In my old cell I found a strange doll which mentioned something about a magical painting. I knew exactly where that was! While digging through my pack I also find another key I hadn't used yet so I returned to Artorias' Arena and up some stairs to a locked tower I completely neglected before. Within I found the fourth "elite" knight of the king: Hawkeye Gough, a blind giant who has retired from dragon hunting and instead now makes wooden sculptures.
He talks a bit about the past, and that dragon slaying is the highest calling for any knight (given that Gwyn's army caned almost all of them). He asks if I am hunting the black dragon, Kalameet. I say yes, and the big guy decides to help out - using his great bow to nail the wyrm as it flies along in the distance. It's not dead though, just grounded. It would be up to me to give the coup de grace.
What a shot - especially for a blind guy!