The Strongest Enemy (episode)

The Strongest Enemy is the fourth episode of Fate/stay night.

Summary
When Berserker and his Master, Illyasviel von Einzbern, attack Saber, Shirou is helpless, but blocks a fatal blow intended for Saber. The next day, Shirou has miraculously healed himself and starts to understand more about the type of person Saber is.