big ice wall

Kamijou was less than ten meters away from Oriana. His fist would never reach her,
though. With a flick of her left hand, she simply put a flash card in her mouth and bit
down on it. On it were the words “Wind Symbol”, written in green.
A moment later, in between the two of them, a fifty-centimeter-thick wall of ice spread
across the street. Their eyes locked from across the clear ice. The wall was huge—three
meters tall. Kamijou ignored it and punched it with his right hand.
There was the sound of glass breaking. The wall shattered at once like gunpowder had
been planted inside it.

- Toaru Majutsu no Index Volume 9, Chapter 4 Part 3