phone explosion

Mikoto fired a lightning spear at the tall ceiling as a warning shot. When the deep popping sound burst across the dance floor, the half-naked women who had been swaying like heads of wheat instead screamed and curled up like pill bugs. With Sakibasu following her, Mikoto shoved the people aside to cut across the polished glass-like floor.

Of course, the club was not going to just let this happen.

Bouncers in black moved from the corners of the dance floor and the second floor, but Mikoto detonated the batteries of the radios or phones in their pockets instead of worrying about their fancy (ha) guns or knives. That was a quick way to incapacitate anyone who did not realize their convenient modern marvels could also be used as bombs. The ones with good instincts or just good luck quickly threw their communication devices away, but that gave them one extra thing to do. The enemy essentially had to sit one turn out, so Mikoto only had to zap each one in turn using lightning spears.

- Toaru Majutsu no Index: Railgun SS3, Chapter 4 Part 1