[yeah. rin did doubt she was aware of this.]

I told you he played a role in murdering my father, didn't I? He thinks he can do whatever he wants to us, I guess. —Anyway, I'm bringing this up not to have you talk to him, but just so you would know. My Servant is more aggressive than I am, Pearl.

[that probably sounds funny to say, but it's true.]

To protect me from Gilgamesh, Archer would take the quickest route necessary. That includes attacking his Master.