"You aren't going to give it to her." Archer's words are blunt; he's cold now. "So forgive me if I'm no longer interested in discussing what Rin Matou needs with someone else's hero."

It's plain to Archer now: Diarmuid ua Duibhne would in the end make the same mistakes Archer himself did when dealing with Rin. He might not betray her so selfishly, because no one is ultimately as selfish and broken as the hero Emiya, but he would fail her all the same.