Fate/Apocrypha translation, chapter 2, pg. 129-136

"Well I give. Somehow, it seems they suspect something."

"But Shirou, could you not see that Saber's true name?" Assassin asked.

Shirou frowned and scratched his head. "No, well... somehow it seems Saber possesses a skill or Noble Phantasm that conceals their true name. I could read their parameters, but beyond that, nothing."

"I believe it's best to quickly crush any uncertain elements. It's not too late, we have someone else we could send."

"No, no, let's leave it be. After all, it's still too early for fighting between comrades." Shirou quickly rejected Assassin's merciless proposal.

"They're not comrades, are they?"

"Our interests are the same - by that point, they can be called comrades. After the Servants of Black have been defeated, it's likely we will have cooperated enough. But more importantly, Assassin, what of your Noble Phantasm? All the components you lacked should have been gathered."

"Ah, after this, all that remains is to perform the ceremony to active the Noble Phantasm. If I have three days, there's no problem."

"Understood. Then the Trifas invasion will begin in about three days."

"Until then, it seems all we can do use the doves to gather intelligence."

Suddenly the two fell silent and turned to face the door. At that moment, someone opened the door and forced their way inside, but upon seeing the intruder, Shirou and Assassin dropped their guards.

"If it isn't Caster. Is something amiss?"

Caster, an elegant man clad in outlandish clothes of a medieval European style, strode down the aisle, raised his hand, and exclaimed: "A horse! A horse! My kingdom for a horse!"

There was a brief silence, then timidly, almost apologetically, Shirou opened his mouth. “...are those your own lines?”

Openly dejected, Caster's shoulders slumped. "What is this?! Do you say that, while living in this era, you know nothing of my masterpieces? MASTER! Please, read this book!"

Saying this, Caster presented Shirou a massive hardcover book. Somehow, he had purchased his own book at the bookstore: The Collected Works of Shakespeare.

Caster of Red: William Shakespeare, the dramatist who boasted the title of the world's most famous writer. Someone who didn't know of his work would not escape being called ignorant. It's said that if you trace back to the origin of all modern literature, certainly you would find the works of Shakespeare.

As for Caster's lines a moment ago, there is one point that cannot be overlooked. Caster called Shirou "Master," yet Assassin is the Servant who serves Father Shirou. Furthermore, neither Shirou nor Assassin seemed to doubt that title. If Caster's words are true, that means Shirou already possesses two Servants.

Such a thing is possible, perhaps, but somewhat peculiar. In the past Grail Wars, there is no case of one Master commanding two Servants. In commanding two Servants, it's likely that the most a Master could do is exhaust their mana and destroy themselves. But if that were true, how much magic does this man named Shirou have stored in his body?

"Even so, the Grail only granted me certain knowledge of your works. At most, I only know you are historically a famous writer."

He looked up and sighed. "Oh, Empress of Assyria, do not say such sorrowful things! To I, Shakespeare, surely those words are the same as denying me!"

"...well. It's like that for you. But, Caster, purposefully coming here materialized... is something amiss?"

Caster, who had gestured grandly in his laments, froze suddenly. He cleared his throat and  hesitantly said, "Eh, well. As they say, "lovers and madmen have such seething brains." Beings like our mad warrior sometimes act out without reason."

"...has Berserker begun to rampage?"

"No, no," Caster denied.

"Then what is it? Try and answer clearly," Assassin pressed with an irritated frown.

Flashing a smile like a royal court's jester, Caster declared, "Berserker has begun walking to Trifas. It seems that, somehow, he's found an opponent he must crush."

"Ah..."

"...oh? That's troubling."

Assassin was at a loss for words while Shirou lazily muttered, "Presently, Archer is in pursuit, but stopping him is a 50/50 chance. I'd say it'd be over after one mistake."

"This is no laughing matter, Caster," Assassin muttered bitterly. This may be obvious - the Servants of Red had been assembled, but it didn't mean the preparations for the war were organized. Furthermore, the Yggdmillenia Clan's servants waited, perfectly prepared in Millennia Fortress. Surely, to send Berserker alone was pointless. One servant would simply die in vain.

"What shall we do, Master? My Noble Phantasm is not yet prepared. In our state, an invasion would be reckless. We would only fail."

"Mischief, thou art afoot. Take thou what course thou wilt!"

"Hmm... so you instigated him, Caster?"

Caster froze and looked away, embarrassed.

"You gave him Trifas's location?! Honestly, you...!"

"Aah, the pitiable mad warrior who seeks out a foe to rebel against. I, Shakespeare, must witness his overflowing agony!"

To Caster, Shakespeare, this world was surely a fascinating tale--No, it <i>must< be so. He loves unique existences and wishes to spin them into stories.

For this reason, a measure of deception or instigation is "okay" to him. Everything is for the sake of the story.

"You're a thoroughly troubling person..." Assassin sighed.

Caster turned to her and calmly explained, "Troublemaker, trickster, that is what they call men like me."

"...It can't be helped, can it? I will request that Archer be sent as Berserker's support. But please order Archer to withdraw if the situation becomes unfavorable. We absolutely cannot stop that Berserker. When his Master's command spells are exhausted, in time we'll only repeat this situation again."

"Understood. I'll send word by familiar to Archer."

"As for me, as Supervisor I must deal with following Berserker's route -- for the moment, we can do nothing else. Caster, you'll be patient, won't you?"

As the war's Supervisor, naturally Shirou must deal with all things involving the concealment of magecraft. If Berserker headed straight for Trifas, the likelyhood of him being seen by bystanders was high. If he travelled in spirit form, that would be fine, but unfortunately it would be best to assume this Berserker didn't have the sense to do so, or so Shirou presumed.

"Oh. Understood, my Master..."

To cheer the discouraged Caster, Shirou smiled gently and said, "Don't worry, Caster, the hostilities will begin before long. The seven servants of Black and Red will slaughter one another in the largest scale war -- the Great Grail War. I trust this battle will sate your desire for a story."