[He's not sure if this is part of the trick or if the other boy is just kind of teasing him. He stares down at the marble for just a moment, wondering what's about to happen. Then the marble just spins and blossoms out into a sphere of air and he's sitting on top of it. There's a yell of laughter as he just...kind of spins around above it while sitting atop the sphere. He-he can't really get how to make himself stay steady atop like Aang does but it's still amusing rotating mid air.]
I think the keywords work here
W-Whoooa! This is amaaaaaziiii-i-i-i-iiing!