First of all Mr Mendes' skin started to change texture and color, becoming green with a white belly. He lost his body hair and nails, but gained longer legs and huge flippered feet, the now webbed and orange toes sticking out over his sandals. His fingers were also long, webbed and orange.
He lost his external ears and nose, now replaced with small slits, but his mouth was wider, and his eyes were red with black slits.
Mr Mendes had become a giant humanoid red-eyed tree frog!