It's a frog-eat-frog world according to "Manda Bala" ("Send a Bullet"), in which tyro helmer Jason Kohn makes a series of scintillating connections between one of the planet's largest amphibian breeders, a Sao Paulo plastic surgeon, a fat-cat politician and a professional kidnapper, each of whom plays a role in the sprawling cycle of violence and corruption that is modern Brazil.