Sand Wall

Kamijou finally balled his quivering right hand into a fist—
—When suddenly he heard Kanzaki’s angry shout from out of thin air.
“Get away from there, Kamijou Touma!!”
The cry of the wind could be heard.
Something that could be called an invisible slash ran across the sand and glinted
between Kamijou and Misha. The earth that was whipped up from the straight cut rose
to form a wall of sand. Misha, who was just readying her crowbar then, averted her
attention for a moment, and in that moment Kanzaki stepped between them.

- Toaru Majutsu no Index Volume 4, Chapter 3 Part 2