stiyl magic circle attack

“Grah, gaaahhhhhhhhhhhhh?!”
All of a sudden, Stiyl bent over like he’d just taken a body blow.
With a loud crack, the map lines being drawn on the ground all scattered in every
direction. It was like someone had sneezed on a picture drawn with sand. Many more
snaps and cracks of things breaking followed. For a moment, Kamijou thought it was
Stiyl’s bones.

“The sound of out-of-control magic power warping space—a simple ghost sound! Kami-
yan, give Stiyl a punch! That should stop it!!”

Kamijou was taken aback by his words. At the moment, he was scared, since he didn’t
know what was going on. He rushed to Stiyl and hastily hit the bent-over boy in the back.
He was trying to do it fast, without thinking about measuring his strength.
There was a pop of air rushing.
Then, as though exhausted, Stiyl fell over onto the ground. Nevertheless, it seemed to
have calmed the situation; he couldn’t hear the weird noises anymore. Stiyl breathed
heavily for a little while, but eventually he combed his sweat-soaked hair out of his face.
“What...was that...? Some kind of defensive spell...in case she was traced...?”

- Toaru Majutsu no Index Volume 9, Chapter 2 Part 9