The guards hover an inch from the surface of the lake, but as soon as they touch it they’re doggy-paddling, hapless. Tyler doesn’t even body-check them. He just skates around, tripping.

On the shore, Daniel’s eating popcorn. Toe kicks an irritated rock.

“I don’t get it,” he mutters. “I bet we could do that too if we could–I mean, where’s his weight distributed? What’s holding him up?”

“Tension,” says Dylan, too close to his ear.

Tyler leans down to brush wave-tips with one finger, and his sandals slice a glittering wave from the arc of his turn.