Instead of rocking with Bono and The Edge, hundreds of U2 fans were forced to ``walk away, walk away'' from the sold-out FleetCenter show Tuesday night when their scalped tickets proved bogus. Some heartbroken fans broke down in tears as they were turned away clutching worthless pieces of paper they shelled out as much as $2,000 for. ``There was a number of people that were just crying,'' recalled Matt Whelan, the FleetCenter's director of ticket operations. ``There were people that didn't know what to do. They were stunned. They had come from all over the world.'' It took Whelan and...