(Reuters) - A federal appeals court on Wednesday revived a fight between BP, two contractors and an insurance company over who should pay for thousands of personal injury claims brought by cleanup workers after the Deepwater Horizon explosion and fire in 2010. The 5th U.S. Circuit Court of Appeals reversed most of a lower court’s rulings for contractors National Response Corp and O’Brien’s Resource Management, and for O’Brien’s excess-liability insurer, Navigators Insurance Co.