Knowing that idiot he'd work for free just to have someone say he was useful.

[Rin didn't spend an overly long time with Shirou, but she didn't need to. She learned enough from their interactions, and from the memories of her Servant. By the time she was warning him about the dangers of Archer's arm, she knew the truth of things.]

—None of that matters. It won't come to pass for me, considering that the world is long gone by now.