While the apeman's using his lasso to help you on the branch, your fur disappears, and your body shrinks.
The transformation's over after only a minute, and you're back to humanity...
... but not to your own body!
You were a 32-years-old, rather tall and muscular guy, now you've become a thin and muscleless young teen, apparently around eighteen, but only five feet tall... and fully naked! You tremble, feeling like an insignificant bug in front of the seven-feet-tall, mighty and fierce Lord of the jungle.
Tarzan doesn't say a word, he just smiles, then you are quickly picked up and placed under one of the apeman's sinewed arms, and Tarzan leaps off the branch.
The trip through the jungle is terrific, but also exciting: at an almost impossible speed, Tarzan alternately grabs vines and jumps on branches, his feet barely touching the wood, while he darts through the air, carrying you as if you were a feather.
You don't know how long that lasts, if a couple of minutes, of many hours, or an eternity; but eventually, you're in Tarzan's house, and there...