It's a movie well engineered as a late-summer diversion — a big cat movie for the dog days of August — that Icelandic director Baltasar Kormákur ("Adrift," "Everest") insures stays well within the paths of man-against-nature films before it. But while the lion is CGI, the South African location is genuine, and Kormákur and cinematographer Philippe Rousselot's long, well-choreographed takes give "Beast" an immersive quality well beyond the genre's usual slapdash cutting.