"Your determined, thats good, though to be honest Ive grown weary of being in charge. Though I suppose I should fight you, I will not. I must leave Karakura for awhile, and so I will hand you the mantle of 'leader' though right now its an empty title. Watch your back though, because when youve become complacent with your position, when you think youre on top of the world, when you are at your peak capacity I will be there to dethrone you. I will always be watching Kisuke, waiting, from the shadows, until the moment to strike is at hand."
And so he left, leaving Teketsu with his 'victory'. He had no use for those who believed themselves to be more powerful than they truly were. Though in hindsight it might have been fun to stick around and see this boys attempt at killing him. No matter, Koori wanted to explore the world for a time, though when he returned he would kill Kisuke and take back his place as leader. He would wait, and he would observe quietly and see how the boy liked being in charge. He would leave the sanctum as it was, sort of a 'gift' towards the new 'leader'. He smirked as he opened a portal looked back once more and said
"Take care of the quincy girl while I'm gone though, I did make a promise and if its broken because of you I will kill you, without hesitation and without remorse."
That being said, he stepped through the portal and left the area leaving the new leader with whatever it was that Koori left him with, whether it was hate for not fighting him, or something else. Either way Koori could care less if the boy thought him to be a coward, like he said before, he'd be back and when that happened they would fight, and then, Koori would kill him without a second thought. For now though he had more pressing matters at hand....