Hong Kong got its first chance on Wednesday to react to the People's Bank Of China's latest money-tightening moves. The Hang Seng index plunged 2.6% in heavy volume. That was its second straight distribution day, bringing the total to four in recent weeks. While that's not excessive, the index's large gap down in heavy trade was worrisome. In Hong Kong trading, BYD, the Warren Buffet-backed maker of rechargeable batteries and electric cars, fell