In a wild game full of twists and turns, the Nationals looked poised to add one final layer of intrigue to what ultimately became a 9-7 Mets win Thursday night at Citi Field. But a sharp grounder off the bat of Daniel Murphy in the ninth inning turned into a double play, the result of a slick play by Asdrubal Cabrera and an interference call against Jayson Werth at second base.