@Rorie: Have you tried dropping your summoning sign in front of the boss areas to regain humanity?
I helped out a ton of people with the Gargoyle bosses before I actually killed them myself, and I got plenty of Sun medals, souls, and a ton of humanity for my troubles.
Can you drop a Summon Sign when you're a Hollow? Because by the sound of things, he's Hollow and he has no humanity to revive into a human so he wouldn't even be able to leave a Summon Sign if it works like I think it does.
It doesn't matter if you're human or hollow, you can always drop your summoning sign. You only have to be human to summon others.