At first , he was unaware of Toph 's prowess , considering that he saw her as blind and helpless .
Master Yu is an instructor at an Earth - bending academy , as well as Toph Beifong 's personal Earth - bending teacher .
At first , Yu was unaware of Toph Beifong 's prowess , considering that Yu saw Toph Beifong as blind and helpless .
Master Yu is an instructor at an Earth - bending academy , as well as Toph Beifong 's personal Earth - bending teacher .