The anger is met with amusement. "Your refusal to answer is precisely why you will fail, little one. You cannot bring yourself to consider and contemplate choices that you may well face, and thus you will not be prepared to make them.

"What would you do, if you were to lose them both because you hesitated? Two dead when one could have been spared? Two dead, while you still lived? What would that do to you, Riku? How would that make you feel?

"What happens, I wonder, when a heartless loses his drive, especially in this World? Perhaps before long we'll be treated to the answer."

Then there's a swirl of black mist and the only thing that Riku has his back to is air and the room behind him.