What if it ends. John wonders what may she have meant: Whenever if she meant whatever she felt for Kanda, or the inevitable immortality that separated her from them. For either case, he thinks he knows the answer.

"It can end." He cannot lie to her. He learned from his world that nothing is invincible. Nothing is infinite. Nothing is eternal. "But ask yourself, if you wouldn't want to try."

A heart materializes around his fingers, as it moves around them. He holds it in a fist, but not enough to damage it.