I Trade the spy's mostly and lately the spread on Island is widening (lets say dropping for this question) before the SP500 futures pit bid drops. The bid will drop out of site before an order is sent to the SP500 pit. I listen to the SP500 pit live and watch a chart of the spoos right beside a Rediplus SPY level II and the prints. Before the pit can call the bid lower. The SPY bid on Island has already dropped out. How is this possible?