Hong Kong stocks followed Tokyo down, the Hang Seng losing its grip on 10,000 after a three-session rally. The index fell 81.27 points, or 0.81%, to 9902.04. While profit-taking accounted for some of the decline, there was also selling of China issues, which had been overbought in recent days. China Southern Airlines was among the biggest losers, falling 3.26% to HK$2.22.