pulls a bench over a river like a skipping stone

Before he knew what was happening, the bench shot to the side like a shell. Kamijou was
still sitting politely on the bench, Birdway was still sitting right on top of his lap, Lessar
was still nestling up against him, Index was biting onto him from behind, and the calico
cat was digging into her white hood with his front claws. They all crashed into a nearby
river.
But there was no great splash and they did not sink into the river.
With a few smaller splashes, the bench flew in low arcs and jumped back up whenever it
touched the water’s surface. It was similar to a skipping stone. Not a single drop of water
reached Kamijou Touma as he sat on the bench. The bench crossed to the opposite bank
of the river, decelerated as its legs scraped across the asphalt and sent orange sparks
trailing after it, and ultimately came to a stop.

- New Testament Volume 8 Chapter 1 Part 8