Bob Wilcox and Gerry Kowarsky review (1) DIE WALKURE, by Richard Wagner, at Union Avenue Opera, (2) TIME STANDS STILL, by Donald Margulies, at Insight Theatre Co., (3) THE TWO NOBLE KINSMEN, by William Shakespeare and John Fletcher, at St. Louis Shakespeare, (4) THE SUNSET LIMITED, by Cormac McCarthy, at Theatre Lab, (5) RED, by John Logan, at Encore! Theater Group, and (6) BIG LOVE, by Charles Mee, at Moonlighting Theatre.