hassan finger

If the Master Kotomine Kirei had lost his Servant, the Seals carved on his hand should have disappeared. But the three deep black stigmas were still carved there.

In brief... The Servant Assassin hasn't been annihilated. Then the masked woman who was currently serving the two Kotomines must be the real Hassan-i Sabbāh.

"Is it regrettable that the man died?"

The woman shook her head with an air of indifference at Kotomine's question.

"That man was one of us Hassans who didn't have any particular forte. Losing only him does not affect us as a whole. Still―"

"Still, what?"

"I cannot say his death affects us, but a loss is a loss. You could say it is like losing a finger. I do not wish to think he was a vain sacrifice."

Kirei listened intently as the woman put forth her growing protest through her humility. Of course that was not unreasonable.

"That is not vain. You can deceive the other Masters by sacrificing one finger. They all already believe Assassin has fallen. Do you not think all of you can now turn the tide of battle under cover?"

- Fate/Zero: Act 2, Part 4