But not long ago, Caster had been firmer than anyone that Jeanne d'Arc (Alter) was a Heroic Spirit born from Jeanne d'Arc's dark side.
These two seemingly contradictory thoughts were not contradictory at all.
Caster had not been constantly deceiving Jeanne d'Arc (Alter) and feeding her false information. Rather, he had been deceiving and deluding himself all along, until even Caster himself believed the lie he had woven.
How could one deceive others without first deceiving oneself?
After countless rounds of self-suggestion, the deranged Caster had directly regarded Jeanne d'Arc (Alter) as the true Saint. If Jeanne d'Arc had not appeared before him and personally declared that there could be no such possibility as the Dragon Witch, Caster might have continued to be deceived by the lie he had created.
But was the truth necessarily "good"?
—Not necessarily!
At least for Caster, he would rather accept the illusion he had woven himself. He would rather believe that Jeanne d'Arc (Alter) was not a defective counterfeit, but another possible version of Jeanne d'Arc.
"That's impossible!!! Jeanne d'Arc (Alter) is the incarnation of Jeanne d'Arc's dark side!"
After his shock and hesitation, Caster roared loudly.
The facts proved that one could never wake someone who was pretending to sleep.
PS: Regardless of whether people say that Caster had a reason to turn dark because Jeanne d'Arc's death drove him to kill children, hateful was still hateful. Those who sympathized with darkened Caster might as well imagine themselves as the ordinary people within the territories in F/Z or Mash Kyrielight and Typhon.
But from another perspective, the Holy Light also rather sympathized with Caster's change of heart. The blow of Jeanne d'Arc's death had been too painful, causing him to fall. In short, this Servant was quite a complex character.
Assassination—What Use