Very subtle... Actually kinda reminds me of a documentary I saw a couple of years back about the descendants of the Iga ninja clan. Apparently, they don't think introducing oneself with the phrase "I'm a ninja" counts as blowing one's cover because, well, what are the odds that anyone would actually believe you and not just brush you off as a buffoon? And being taken for a buffoon is EXACTLY what a good spy should be aiming for.

I get the impression the teacher isn't really involved in the business.

Another normal professor!

Hey I would have figured it out eventually

Is Cellias eye always green like that or is her ability active??

Feels like Null?

I can already tell the teacher loves to yell SNEAK ATTACK!!