When he refused her request for money, arguing she would only spend it on more crack, Leidiane became sullen and angry.
The 4300km truck stop which has brought misery for Leidiane and thousands of girls aged as young as nine is now being called "the highway to hell".
Shaw works almost every day, including Saturday classes at some studios.
After writing two books about girls lost to prostitution, "Street Girls' and "Remember Me, Rescue Me", Roper set about establishing a charity and safe house for Brazil's female child prostitutes.
In another town further north, Roper said "of the 60,000 inhabitants, around 6000 men were involved in town's child prostitution trade".
UNICEF says the BR-116 is the world's most active highway in terms of sexual exploitation of children.
Talent is important, but what goes along with it is discipline.