He met a killer wielding a knife.
All they knew was that it was a boy, seventeen or eighteen years old, who was erased from the records.

[...]

And then, the teacher who was secretly respected released the Kihara to protect the students.

He used both hands to grab onto the shovel in the flowerbed nearby and ran at the killer without hesitation. He used a slight shock to the jaw to impair the killer’s consciousness, and gave him a hypnotizing-like effect. Using that moment, he attacked the killer who was completely defenseless.

Continuous hits of metal could be heard.

Through the pathologist’s analysis, the killer’s head had five areas that were dug in. As for the perfect cause of death that didn’t give any pain, the pathologist questioned if Kihara Kagun was reading a human’s anatomy textbook as he killed.

Toaru Majutsu no Index New Testament vol.4 sub 22