Exhilarating. So satisfying.
The old worm had to die. This was too satisfying.
Matou Zouken's true body had been parasitizing Matou Sakura's heart, but Sakura Matou had ripped it straight out.
After the Matou Sakura in the scene had the power of the Black Holy Grail within her stirred up by Matou Zouken, a black, jellyfish-like shadow emerged. It was the very thing that had appeared in the Fourth Holy Grail War, and it directly possessed Sakura Matou.
However, Matou Zouken believed he could control Sakura Matou, only for her to turn around and kill him instead.
Even as he died, Matou Zouken was utterly bewildered. Yet his terrified, agonized cries soon revealed what had happened.
It turned out this had been Caster Medea's contingency plan.
Red A: "I see... Although Caster used her power to stir up the Black Holy Grail's power within Sakura Matou, she saw that Sakura Matou's fate was one of total control."
"That made her think of herself. Hadn't her own life, too, been controlled by the Greek gods until it ultimately fell apart?"
"So, although she did something terrible to Sakura Matou, she also gave her an opportunity—she buried some of her own power within Sakura Matou. When the Black Holy Grail's power within Sakura Matou was stirred up again, Caster's power activated as well, allowing Sakura Matou to break free from Matou Zouken's control."
The people of the real world also understood what had happened from those words. As they came to this realization, they could not help but sigh.
Though Medea had appeared as an antagonist, calling her a purely evil person would be going too far. Her conflict with Emiya Shirou and the others had merely been a matter of opposing positions.
Still, in these details, it could be considered a