To prevent the slave from cheating, Queen Hanna and Mistress Jane sit on his face. This way he is guaranteed not to get any air! This facesitting method teaches him to go beyond his limits and go without air for longer periods. That's exactly what Queen Hanna and Mistress Jane want to achieve with him, because as long as he impresses no one with how long he can currently hold his breath for and that urgently needs to be improved!