 Angrily amused at Baiano's pleading, Nascimento grabs a .120 shotgun, hands it to Matias and orders him to finish Baiano off as both a vendetta for Neto's death and as a final rite of passage for himself.As Baiano pleads and cries, Matias cocks the gun and the screen cuts to black as a shot is heard.The movie is based on "Elite da Tropa", a book by two BOPE policemen ("Batalhão de Operações Policiais Especiais" - Rio de Janeiro military police squads for special actions), André Batista and Rodrigo Pimentel, together with sociologist & anthropologist Luiz Eduardo Soares, which provided a semi-fictional account of the daily routine of the BOPE as well as some historical events, based on the experiences of the two BOPE policemen.