User blog comment:Hitsuji Mamoru/Servant Creation Room 2 : Guess of the Who/@comment-32599925-20170807051002/@comment-32599925-20170813132832

Yes, but she was taught by Norikata. The divergence point was her not using the experimental drug, although that made it so Norikata never figured out that there was something wrong with his formula. Norikata ended up becoming a vampire during the process (accelerating his own time until he reached the end of the universe) that would allow him to witness the Root, and he had them break the spell without their realizing it was due to his bloodlust.

Kiritsugu is the first one turned into a ghoul, but Shirley manages to get away until she's able to lure Norikata back to where they'd set up the time-spell, and traps him in it. As happens with Dead Apostles that can't feed on anything else, he tore himself apart.

In my view, Shirley always had much greater potential as a mage than Kiritsugu (who fought with far less magecraft than most mages for the most part), as she was able to do time-manipulation magecraft with almost no training at all compared to most mages. Said time-manipulation was worthy of Norikata getting sealed, so it has to be something special.

I'll update the profile, but I'll refrain from posting anything else for a while, I guess.