[ it's still a little bit strange to hear one of his students talk about his grisly past so freely; fortunately, Korosensei isn't particularly sensitive about it. The experiments were painful at the time, but, compared to what he'd endured before - and what he had to suffer not long after - they're nothing more than a bump in the road. Perhaps the part that's strange is having Nagisa know exactly who he used to be while still treating him in the same way as he always did. (He's grateful for that.) ]

A pop quiz, huh? [ he seems amused, but unfazed, green stripes appearing as obnoxiously on his skin as ever. ] Too bad! A teacher can't be caught off guard by something like that! Especially not when it concerns my students! I told Sugino-kun that his strength lies in his elbows and wrists.

[ the real question is why do you remember that nagisa?? somehow, sensei isn't surprised. ]

Much like your strength lies in your insightfulness and bravery. You noticed the difference in our memories much faster than any of the adults here did.