BAD BREAK. Regarded as the nation's best female figure skater, Nancy Kerrigan hoped to keep her focus on the gold medal through next month's Olympics in Lillehammer, Norway (story, Page 53). But last week, an unidentified assailant wielding a metal bar severely bruised her right knee just after Kerrigan left the practice ice. The injury forced Kerrigan, 24, to withdraw from the national championships, where she was favored to win a berth on the U.S. Olympic team. Depending on the speed of her recovery and a decision by the International Skating Union, Kerrigan may still be able to
