Okay, so here was the tricky part... removing the wand, ending the spell, and tying off the balloon all with only having these two hands. The fuller Mo's balloon got, the more he dreaded that final moment when he'd either be amazing and quick and clever, or he'd get a face full of helium and probably hear his voice go up about two octaves. It wasn't the end of the world, but he was a seventh year and sorta wanted to end things on a high note.

Just not... that kind of high note.

Finally, the balloon was uber full and as round as a ripe watermelon, and Mo jerked his wand free and pinched the end of the balloon shut. By holding his wand between his second and third finger, Mo could juuuuuuuuuuuust tie off the balloon, although he was getting a full blast of helium up his nose in the process. Don't breathe. Do. Not. Breathe.

"Okay, now what?" Mo asked as he pointed the wand away from his face and finally ended the spell. OH MERLIN WAS THAT HIS VOICE?