Riley Keough and Gina Gammell’s War Pony embodies the unconventional spirit that’s marked the former’s acting career. Shot on location at the Pine Ridge Indian Reservation in South Dakota and starring a cast of indigenous Lakota non-actors, the film …Riley Keough and Gina Gammell’s War Pony embodies the unconventional spirit that’s marked the former’s acting career. Shot on location at the Pine Ridge Indian Reservation in South Dakota and starring a cast of indigenous Lakota non-actors, the film …