AT LEAST RUBEN RIVERA UNDERSTOOD HE WAS STEALING: Pirates outfielder Derek Bell, signed before last season to a two-year, $10 million contract for no discernible reason, had a truly horrific season last year and looks worse this spring. So how does he react to the news that the Pirates might be considering other options - such as players who might actually be able to play? He threatens to commence "Operation Shutdown," as Mark Kriedler explains. One question that Kriedler doesn't answer: how would "Operation Shutdown" be any different than what Bell has done since the first half of 2000?