"I can't get sick so long as I'm acting as your Servant," he replies, frowning a little at the sudden shift to a more practical topic. "But if I die--well, I don't know if I'd come back anymore, but if either of us die we'd wind up back in the hands of the government, Rin. So I can't let that happen to you."

Wait, wasn't this about him a moment ago?

"That's a vow I'll make. I refuse to let you be hurt or die."