With the Dodgers in town and the stakes raised for an August four-game set, the Rockies’ relievers wilted at Coors Field on Thursday, turning a potential win into one of the toughest losses of the season. Los Angeles blasted five late-game home runs off the bullpen in the 8-5 victory over Colorado, with the deciding strokes coming by Chris Taylor and Brian Dozier off Wade Davis in the ninth inning of an affair laden with momentum swings. “It was two well-pitched games by the starters, and the relievers had a rough time,” manager Bud Black said.