After hearing my mentor summarize what we had seen, Touko nodded.
“I didn’t see that coming. I’ve also heard of that Seal Designated spell created by
Emiya.”
Since it was under a Sealing Designation, it had probably shared the title with Touko for
a while. For that reason, it would make sense for her to understand the spells of a mage
who shared her fate.

The Case Files of Lord El-Melloi II, Volume 9, Chapter 2