The second declarer found a psychologically better play: He took the K-A of clubs and continued with dummy’s jack. East could have ruffed and cashed a spade, but it looked to him as if South had held K-5 in clubs. Since East didn’t want to spend his high trump to ruff a loser, he discarded.
South produced the queen, went to the ace of diamonds and led the high club. East ruffed, but South threw his last spade and lost only one more trick, making game.