Return chop to skillet along with any juices accumulated on plate, then add water, cream, and sage and simmer, covered, without turning, until thermometer inserted horizontally into center of chop (avoid bone) registers 150°F, 5 to 6 minutes. Transfer chop to a clean plate, then simmer sauce, uncovered, stirring, until liquid is reduced to about 3 tablespoons, 1 to 2 minutes. Stir in parsley and salt and pepper to taste. Spoon sauce over chop.