"This," Magnus says, jumping up and gesturing to the trampoline at the edge of his clearing, "is a trampoline. They're very springy." He climbs up onto it and jumps a few times. He's learned exactly one skill with it since he dragged it out here the other day. He's at about 85% success with it?

After a few more jumps, he tucks his legs up, and attempts a mid-air somersault. Oooh, that's definitely a solid 8/10.