With one massive swing of his bat, Ryan McMahon shut up the vocal contingent of Mets fans at Coors Field on a rainy Saturday night. The Mets had taken a 7-6 lead in the seventh and the shouts of “Let’s Go Mets!” took over the LoDo ballpark. But in the bottom of the frame, the Rockies third baseman, who’s been mired in a deep slump for much of the season, hit a two-run homer deep into the second deck in right field off right-hander Jeff Brigham for the go-ahead run in Colorado’s 10-7 victory. McMahon’s home run was his second in the last two games, that after going 103 at-bats without a homer. “Anytime you feel like you haven’t been coming through for the team a lot lately … it’s indescribable,” McMahon said.