NEW YORK CITY has always been ahead on this virus, compared with the rest of the United States. It was first to face the tragedy of overwhelmed hospitals and widespread deaths, and then first to recover something that looked like normality. This summer, the restaurants spilled into the streets. The art museums reopened. Sunbathers could again bask in Central Park without risk of seeing their torsos shamed in an evening news segment. But last week, New York, both state and city, teetered back into grim territory.