Curufin well understands that the question is complicated. It was for him, in his day, and it could be nothing less for Xue Yang, with his history.

"And that was Xiao Xingchen, of course, the one you cared for enough to want to change. I saw him leave through the turnstyle at the platform. I spoke to him only once, when he first arrived, and so I don't know him well enough to make statements about him and his thoughts or feelings. But I'm guessing he'd be pleased for you, that your vow would matter to him. Besides, the multiverse is immense and mysterious, and when those of us who travel lose someone, there is a chance we'll meet them again." He knows this from experience.