After paying homage to John Woo’s heroic bloodshed movies in his drug-cartel thriller The White Storm almost three years ago, Hong Kong filmmaker Benny Chan Muk-sing has returned with his best film in years in Call of Heroes, a Chinese wuxia epic with obvious echoes to classic spaghetti Western films and Akira Kurosawa’s samurai dramas like Seven Samurai and Yojimbo.