Red Shadow Aka Kage Rating: * * 1/2 Director: Hiroyuki Nakano Running time: 108 minutes Language: JapaneseOpens Aug. 11 at Marunouchi Toei and other theaters Silent-era samurai movies fulfilled the same function as the westerns of W.S. Hart and Tom Mix: They entertained the common herd, particularly rowdy boys, with larger-than-life heroes and action.