For a magus, the layout of his workshop can be said to be the compilation of the sorcery he mastered within him. Consequently, capturing the workshop means possessing the equivalent power, skills, and everything of the resources, and to challenge head-on.

Especially the one who is called the hero of sorcery, Servant Caster. The ability of the class' attribute, “Territory Creation”, is amplified. As long as he possesses the skill which enabled him to create within the shortest time, the workshop which demonstrates the very best result whatever the terrain and requirements are, in this battle, Caster is the one who can boast of being the strongest among the seven Servants. Because of that, in going against that workshop, reckless actions like attempting a head-on bulldozing action, even if it were Caster's natural enemy, Saber; would be equivalent to suicide.

Such a standard of reasoning should be understood even by Rider, but apparently, this Servant did not even have the slightest consideration for that. Before one noticed, Rider had already materialized the “Sword of Cypriot”, sheathed it, and in that manner, tapped Waver's shoulder whilst grinning broadly.

- Fate/Zero: Act 8, Part 2