SAN FRANCISCO — The quiet in the Rockies’ dugout permeated throughout AT&T Park, contrasting starkly with the raucous home crowd that surrounded it. Adam Ottavino had just surrendered two runs in the eighth to give a one-run lead back to San Francisco, and Colorado was three outs from its tenth straight divisional defeat. Then, with one on and one out in the ninth, DJ LeMahieu stepped to the dish and smacked a two-run homer to left, yanking the Rockies up from the baseball abyss — for Thursday, anyway. Boxscore Nolan Arenado put Colorado ahead in the first with a 409-foot blast to center, his 10th career home run at AT&T Park which surpassed Troy Tulowitzki for the most dingers by a Rockies’ hitter at the stadium.