The chakra contracting and expanding all in one moment, tissue and muscles forced to strain and reform in a quick movement that forces excess water out of his body to make a visage of smoke around him.
It bows his back and immediately bends it back and he feels weightless for a brief moment at the new placement of muscle and weight, bone density and heaviness. His eyes which were closed in concentration open, and he fells the very shape of his skull change and he blinks and his eyes feel more exposed and his scalp feels itchy.
When it does finish and the mist lifts away, he stands in his small hobble of a room and stares at the girl in the mirror before it disappears again behind a veil of steam and sweat and sudden hunger.
He decides not to think about the joy he felt in that brief moment, that he wasn't himself, that if he choose to be, he could be someone else for a change. That this time, maybe the villagers would speak to him, instead of just Sarutobi.