YES! Best feeling ever from a game!
Not sure Sif made the fight that much easier in the end. He didn't even aggro Manus except for one occasion (though that did enable to drink an estus). Think the key was sticking closer to him. That attack where he throws out that ring of dark orbs was doing me every time and I was never close enough to run into him reliably and it would one-shot me. However, as I could roll back out of the rain and dodge his other attacks, sticking close to him made things much easier and I hit with more of my spells too. YES!
EDIT: And yeah, Dave that is absolutely right! The times earlier it had gone to my head getting him down so low on health. Last time I was much more methodical and careful.
EDIT2: Those runs at Manus were actually great training for me. Forced me to up my game, got me out of my heavier armour back into my chain set for <25% load fastrolls, broke my habit of turtling with a shield and forced me to get used to being more mobile.
Love how such a challenge paid off like that.
As a result, I was able to take down Kalameet on my first attempt - which I have no doubt I would have failed to do had I not learned and adapted from my epic struggles with the Father of the Abyss.