roasts some punks and runs 2km

“Really now, what are you doing? Do you think protecting those delinquents makes you
a good person? Are you some overzealous teacher?”
In an instant, Kamijou’s body froze over.
Because the bridge had no lights, Kamijou had not noticed the girl standing about 5
meters ahead in the direction he had been running, a completely normal middle school
girl wearing a gray pleated skirt, a short-sleeved blouse, and a summer sweater. Kamijou
stared up into the sky and seriously considered collapsing onto his back. The girl before
him was the same one from the family restaurant.

“Wait, so that's why they stopped chasing me?”
“Yeah. They annoyed me, so I roasted them.”
The zapping sound of bluish-white sparks echoed. Rather than a stun gun, as her
shoulder-length brown hair swayed, sparks flew from it like an electrode.

- Toaru Majutsu no Index Volume 1, Prologue