Stocks continued to vacillate Friday afternoon. A big drop in consumer sentiment offset an early pop from better-than-forecast employment data. The Dow Jones industrial average rose 0.4% and the S&P 500 edged up 0.1%. But the Nasdaq lost 0.5%, hurt by losses in Apple (AAPL) and Google (GOOG). Volume was still tracking lower on both major exchanges, especially the Nasdaq. TransDigm (TDG) dropped 4% and sliced its 50-day line in heavy trading. Late