MEXICO CITY — There’s a lovely scene in Terrazas’ “Bayoneta,” presented in rough-cut at Los Cabos, where a Mexican boxer, played by Luis Gerardo Méndez, jogs through woods in Finland, preparing for a fight. His training is punitive. But the chords of music which hit the soundtrack evoke the elegiac tones of a Western. From a few scenes glimpsed, and declarations, “Bayoneta” is many things: A plaint for a soon-to-pass world of simpler, physical effort; a homage to boxing films – “Kyzza and I agreed that we didn’t like boxing but did like boxing films, and wondered why nobody had made a film about Mexico’s boxing scene,” Rafael Ley, at Woo Films, which produced with Panorama and Stacey Perskie. It comes in an the immigrant’s experience from a novel angle. “I always say this film is not about boxing, it’s about immigration. The States is not everything, there are other places too. Mexico is trying to find it’s place in the world,” Méndez said. More than anything else, the psychological drama is also the latest surprise departure from Terrazas. To all accounts, “Bayoneta” has little to do with last year’s “Somos lengua,” Terrazas’ documentary on rappers, nor 2011 imploding young couple drama “Machete Language.” But it does represent one more turn in one of the least predictable careers in Mexican cinema.