Leo Barraclough International Features Editor The trailer has debuted for feature documentary “Dancing on the Edge of the Volcano,” which will have its world premiere in the Main Competition at Karlovy Vary Film Festival. Reynard Films is handling international sales. Cyril Aris’ film centers on the aftermath of the catastrophic explosion at the port of Beirut on Aug. 4, 2020, which leaves a large part of the Lebanese capital in ruins. In the midst of the chaos, a film crew face an overwhelming decision: to continue the production of their movie or abandon it? They are torn between their firm belief in the transformative power of cinema and a deep sense of cynicism about its ability to effect change in a nation plagued by economic turmoil and societal collapse.