

When Tatsuya learns of Mizuki's sensitive eyes, he thinks to himself that he
has to take care not to let her discover something about him.

**Unmarked spoilers below.**

What was it that she could discover with her ability?

Possible things:

  * The seal Miyuki placed on his abilities (since mantaining the seal uses up her magic processor, it is a kind of ongoing effect).
  * His special abilities. Like she could sense his use of elemental sight.
  * The fact he was not a born magician (his mother used a magic surgery to implant a processor in his brain).
  * That she could catch him using flash casting 
  * Something else?

Also, if the source material can be referenced (like the novels or something),
all the better.


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the-irregular-at-magic-high-school
What exactly was Tatsuya afraid that Mizuki could discover with her sensitive eyes?


If my understanding was correct, he was afraid that she would discover his
unique constitution (the extremely high psion count he had) which allowed him
to use some of his really overpowered and rarely seen spells such as Gram
Demolition. Knowing that he has this specific constitution would make him a
suspect when spells that require this constitution are cast.

Tatsuya tried (and failed miserably) to keep a low profile and avoid divulging
any information about his powers, as some of these were national secrets (due
to him being a special member of the JSDF 101 Independent Magic-Equipped
Battalion) and the Yotsuba wanted his and Miyuki's identity as members of the
family to remain secret.


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2 things:

first - high psion count

second - use of "Pledge" to limit his powers (including psion count)

**Mental Interference Magic - "Pledge"** is an Outer Systematic Magic. Outer
Systematic Magic does not deal with physical objects but spirits or to be more
precise pushions.

Mental Interference Magic though not directly deals with spirits (information
bodies with pushion core) but there is a high chance that it involves dealing
with pushions ( _In Visitors' Arc - it was Miyuki's magic - Cocytus - which
could destroy the parasites. Tatsuya's "Far Strike" could only strip the
parasite's outer psion body and force them to enter hibernation._ )

**P.S. - Cocytus is a form of Mental Interference Magic.**

Mizuki has a special pair of eyes which can see pushions. This made Tatsuya
afraid of Mizuki. Even among magicians who are sensitive to pushions, Mizuki
is a special case. Her eye is known as **"Crystal Eyes"** (Eyes that can see
God). This allows her to see even different shades in spirit's colors.


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