They've been hinting at a past between Sakura and Rin for a while now. Anyways this ep was amazing, the fight between Saber and Assassin was what I thought the fights in Bleach would be like. The thing that Caster said at the end led me to believe that they both impaled each othersince she said that she only needed one sacrifice not the both of them. And if Kuzuki is such a killer I wonder why he saved Caster.