I must. [ there are no other options, no choice aside from the one set before him. the failures of his future self would not be his own.

he can change the future, for vash and their sisters' sake. ]

... He's too kind. I know it's his weakness. [ the way he performs for the doctors and even for rem. playing at human for too long he'll lose touch with what he really is. ] He's accepted what happened to our sister, but I haven't. I refuse.