LOS ANGELES—The Dodgers still have a heartbeat in the NL West race, and it was throbbing late in the game. Corey Seager hit a go-ahead, two-run homer in the eighth inning, when Los Angeles went deep four times to rally past the San Diego Padres 11-9 on Wednesday night. Dodgers manager Dave Roberts called it “a crazy explosion.” The defending World Series champions trailed 9-6 before Max Muncy and AJ Pollock began the onslaught by going back-to-back off Emilio Pagán (4-3). With one out, Cody Bellinger launched a shot to right field that tied the game. Pinch-hitter Justin Turner doubled to deep left and scored on Seager’s shot to right with two outs. “That’s a whirlwind in a really short time,” Seager said. Thanks to their scintillating comeback, the playoff-bound Dodgers remained two games behind NL West-leading San Francisco with four to play in the regular season. The Giants beat …