"And you, blondie. Trying to take me by surprise is fine, but you're way too obvious
about it."

At Touko's words, Flat dumbfoundedly lifted his face out of the mud.
"...w-why?"
"Is there a way I wouldn't notice? You've been going off over and over against Galiasta's
men, haven't you? Obviously, you've found some method to read the flow of their
magical energy. A common enough talent, but your application of it is rather
spectacular. No proper lecturer at the Clock Tower would teach you how to interfere
and reverse the effects of another's spell. You then force a boomerang effect and make
them take themselves out."

As if truly admiring what she had seen, Touko had become quite talkative.

The Case Files of Lord El-Melloi II, Volume 3, Chapter 2, Part 3