One fund’s decision to walk away from Eastman Chemical may illuminate what’s really driving the stock’s prolonged slide.New York City-based Atlantic Investment Management fully exited its position in Eastman Chemical Company (EMN 1.62%) in the third quarter, reducing holdings by 134,710 shares and approximately $10.1 million, according to its November 14 SEC filing.What HappenedAccording to its SEC filing dated November 14, New York City-based Atlantic Investment Management completely sold out of its positi ...