As he stood above her, watching her fall, Akise Aru realized something. He realized that this girl, this irritating, murderous, lying girl, was the one that Yukiteru loved. He realized that she, not himself, had been the one that he cried over for thousands of years. He realized, with a pang of emptiness, that he never would be the one he cried over. Never would be the one who gave Yukiteru joy and love. He realized, in that moment, as she fell, that she was the one who could do those things. He realized that she was the only one, as Yukitueru himself was the only one who could do those things for him.
And with that in mind, he gave up on himself and caught the girl who he had caused to fall. And, instead of that girl, despite how much he would have liked to, he let his hope fall.