The floating objects in the sky all turned. If they were ships, it looked like they had turned to face him. And then they opened their mouths. The openings were lined top and bottom with teeth. The air began to shake as the vessels roared. Deep within their mouths, a light began to glow, growing brighter and gathering intensity until it seemed they were about to fire.

“Die.”

...

The light gathering in the mouths of the countless ships winked out. And then they fell.

Whatever power they had used to stay floating in the air, it was only natural that they’d fall if they died.

-Volume 8 page 142