wires vaporize water

An explosion ripped through the Academy City night.
It wasn’t from flames. It was a shock wave from a massive eruption of water.
Acqua had used magic to control the vast stores of river water, creating a giant hammer
that almost scraped against the underground city’s ceiling. Kanzaki’s wires cut through it
brutally. Tons of water in the shape of a construction arm were instantly vaporized,
sending steam everywhere. But Acqua controlled that steam in turn, converting it into a
glittering cloud of diamond dust.
He had more than just a hammer at his beck and call. The entire fourth stratum, almost
two kilometers across, was already in his grasp.

- Toaru Majutsu no Index Volume 16, Chapter 3 Part 3