That is what the apocalypse means, doesn't it, Rin?

[ The end of everyone and everything. Something he's faced even though she hasn't. Not yet.

He's quiet for a moment, then- ]

I have sworn my blades to you, Rin. The course you wish to take, what you believe is right -- I will follow where you lead to the best of my ability.

[ Even if he's pulled in other directions, even if he sees another path, a bloodier, more expedient one, he will try stay with her as he didn't before. That is all he can offer her now. ]