Fate/stay night Season 1 Episode 8

Dissonant Melody

Shinji says things like how he has no intention of fighting and he was just dragged into this war. He asks to make an alliance with Shirou to go after Rin but Shirou refuses. Shinji says because he doesn't know magic other Masters can't detect him so that means Shinji isn't the other Master Rin was detecting, meaning there is a fourth one at the school. Before Shirou leaves Shinji tells Shirou about how one of the Masters has set up base at a temple.Shirou gets home and is yelled at by Saber and Rin, Rin having come over after Shirou didn't come home. Shirou tells them about Shinji and the Master at the temple.Shirou and Rin both agree, against Sabers judgment, that they should not attack the temple yet as they don't know what Servant and it may be a trap.Saber brings up again with Shirou the temple but Shirou insists that they won't be going. After Shirou is asleep Saber mentions how naive he is and dons her armor and heads towards the temple herself where we see a new Servant we haven't seen before waiting.