Bidding places their honor cards

Stanislaw J. Lec, a Polish poet and aphorist, wrote, "There are grammatical errors even in his silence."

If you were told at the beginning of a deal that your side was going to be outbid, your partnership would probably do best to stay silent, passing throughout and not giving the opposing declarer free information about your hands. True, sometimes being active in the auction will push your opponents into the wrong spot; but not often.

In this deal, North-South reached four spades after West had opened one diamond. West, with an unappealing lead, selected a heart as the least of evils. South won with his king, played a spade to dummy's jack and cashed the spade ace. How did declarer continue after East discarded a heart?