The Beginning of the Circle Episode 6

Saber defends Shirō from Archer despite her chances of disappearing without a Master to anchor her down to the world, stating that she swore an oath to protect Shirō and that it remains unchanged. However, she is overwhelmed by Archer, forcing Shirō to intervene and take over in the fight. Rin takes advantage of Archer's distraction to form a Master-Servant pact with Saber, which she accepts, therefore making her Rin's new Servant. Fully restored, she subdues Archer, who mocks her for her wish of rectifying her legacy. He then casts Reality Marble, a spell that creates an alternate reality. Shirō, Rin, and Saber are subsequently transported to Unlimited Blade Works, Archer's Noble Phantasm, which is an alternate reality consisting of a barren wasteland filled with swords and levitating gears. Archer creates several duplicates of Saber's sword and fires them at her, but Shirō summons a sword of his own and destroys the duplicates, dissipating Unlimited Blade Works as a result. A weakened Archer grabs Rin, intending to use her as an insurance policy against Shirō and Saber while he recuperates. Before he flees, Shirō tells him to meet up with him at Illysaviel's villa. Later on, a restrained Rin wakes up after having another dream about Archer, and confronts him about his past as a Guardian. Then, Shinji and Gilgamesh arrive, and Archer agrees to give Rin to them for their own needs after he has finished killing Shirō. Back at his house, Shirō tells Saber to let him battle Archer while she rescues Rin, also implying that he knows of Archer's true identity. As they make their way to Illysaviel's villa, they are joined by Lancer, who is also determined to rescue Rin.