S1E6: The Wandering King's Rock 'n' Roll

After leaving the detention center, Saber and Ayaka wander through Snowfield in search of allies. Before long, the two entered a forest made home by Lancer, the Servant who recently engaged in a spectacular battle against Archer. Challenged to prove his prowess and determine whether they would make suitable allies, Saber unleashes his Noble Phantasm as Lionheart.