That's a strange thing to thank me for. Don't do it.

[She's not certain why Sakura is crediting her for that in the first place. Her gratitude carries a weight to it she wouldn't associate with being satisfied simply knowing. Does she think Rin has something to do with that?

Well, she doesn't particularly want to kill Shinji. Rin truly sees him as harmless, and knowing he's only made it so far by being used as a pawn of others irritates her. Still, as the only viable Master left in this war besides herself, she can in no way guarantee he'll keep his life.]

Though I suppose given everything you've said, I should be thanking you.