The vibration it scattered through the air struck the coming shockwave and forcibly altered its direction.
“What…did they mess up? My ears don’t hurt.”
“I sent a wave of my own towards their wave. It cannot be seen so it may be difficult to understand, but a shockwave can easily be influenced like a billiards ball using other waves or obstacles.”

Toaru Majutsu no Index New Testament vol.6 ch.6 pt.3