If we are to believe Shinji then he isn’t the one who attacked the girl in an earlier episode. With his kind of personality it’s hard to trust him, but there is support that a 4th master goes to the same school. According to Shinji, Sakura is not involved or has any knowledge of this war. In a way I think that’s a good thing, but on the downside not being involved will probably cut back on the number of scenes she’s in. One of the key scenes in this episode was Rin deciding to temporarily live with Shirou. It was pretty unexpected, but a pleasant surprise nonetheless. Defying Shirou’s wishes, Saber goes off to engage a new servant. I didn’t think a servant would disobey their master. I guess it just goes to show their loyality isn’t absolute.