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I was concerned that if I used Great Chaos Fireball, I would damage him as well.
Good to know. I was under the impression that if you attack any of them, it doesn't count. My first playthrough, he was just below 1/2 health, and I fought them all at once. It pissed me off real bad. The only thing that game me trouble the whole game.
If you bred HK-47, Shale, Chai Ka and Wrex, the gaming world would explode from sheer badassery.
Drop into the pit and kill all but ONE of the octo-demons. Then head back up and speak to Siegmeier. He will offer to help you out. He will jump down and start fighting the last demon while shouting an epic battle chant. Jump down and quickly help him kill it. Make sure Seigmeyer has MORE than 50% of his life remaining. After killing it. Speak with him and he will take a nap. You are done here. Carry on with the level or warp back to Firelink Shrine and speak with Seiglinde. Tell her you have seen her father again and she will thank you. Warp to Path of the Dragon Covenant Bonfire in Ash Lake. Head to the first bonfire in the area and you will find both Seigmeyer and Sieglinde alive and well. Speak to them and you will receive a Titanite Slab. You want this outcome as after its all said and done you can kill Seigmeyer for his ring. Be careful though as you will have to fight both of them at once. END QUEST LINE.
This is copied exactly from the Dark Souls Wikispaces site
Hope i helped :)