LOS ANGELES — After the first strikeout, Dalton Rushing was steamed.Batting in the bottom of the third with one out and the bases loaded, the Dodgers’ backup catcher swung through three straight breaking balls low and out of the zone from Baltimore Orioles starter Trey Gibson. Rushing retreated to the bench, shaking his head as he descended the dugout steps and threw his bat down in disgust.The vexation grew after the second strikeout. With two outs in the fifth, Gibson whiffed Rushing on a slider nearly identical to what had punched him out in the first strikeout. Rushing’s reaction was nearly identical.As for the third strikeout? Rushing worked a favorable 3-1 count off Tyler Wells to lead off the bottom of the eighth, but chased two straight high cutters. He had some choice words for himself, as picked up by the field mic, then returned to the dugout where he promptly snapped his bat over his knee.When Rushing came to the plate with two outs in the bottom of the ninth inning, with the game-tying run on second and the game-winning run on first, he knew the only chance he had to salvage his night was clearing his head and starting fresh — much easier said than done. Rushing fell into an 0-2 hole against Orioles closer Ryan Helsley, putting the Dodgers a strike shy of a bitter loss.Instead, Rushing went from hat trick to hero. His game-tying single, combined with a critical defensive miscue from the Orioles, propelled the Dodgers to a 6-5 walk-off win Friday night, the fourth-straight one-run victory for Los Angeles. It was also a key moment for the Dodgers’ 25-year-old backstop, who is learning how to manage his emotions.