Capoeira is a competitive martial-arts dance, a Brazilian specialty. Sergio Henrique, left, is such a specialist in the form that he is known as Mestre (or Master) Gargamel. He’s working with Robert Pacheco at Nós do Morro, an arts collective in the Rio de Janeiro favela, or shantytown, known as Vidigal. They are accompanied by, background left to right: Marilene Gonçalves, Selma Miranda and Isac Douglas Nascimento. (Wania Corredo / For The Times)