However, by the time the shockwave had expanded, the two men were nowhere to be seen.
They had leapt up into the night sky.
With a slight delay, the sound of their footsteps resounded through the darkness like gunshots. At almost 10 meters in the air, the giant swords struck twice and then a third time. The sparks looked like flashes of lightning and the knights saw the shockwaves spreading out spherically like fireworks.
Someone gave out a cry.
Someone bent over so as not to take as much damage.
The spiral of shockwaves knocked them back evenly.

Toaru Majutsu no Index vol.18 ch.5 pt.3