You didn't know much about the island yet, so you talked with the man named "Francois" who was basically an geologist, who owned a museum on the island, which studies different plant, and rock life on the island. According to his research, there are magic stones on this island, that could basically change anyone's body.
You both were in the jungle, as you continued your discussion. "With these stones, anyone could be changed, whether it is just temporary," Francois explains, as he sits on top of a stump on the ground, while not getting pain from it. Most tree stumps would have splinters on them, but you find that this island makes you immune to pain. Just then, you spot a magic stone on the ground, as you pick it up, and see the sun reflect from it, as the light began to shine on you, and give you a body change.