NEW YORK — It just keeps happening. These Royals just hang around and hang around and wait for one key mistake. Then they pounce. For the seventh time this postseason, the Royals came from behind to win. Fueled again by a patient offensive approach and a devastating defensive mistake — this one by Mets second baseman Daniel Murphy — Kansas City grabbed a 5-3 win in Game 4 of the World Series on Saturday night at Citi Field.