Britain's Got Talent act The Dark Hero seriously wowed the judges Simon Cowell, Amanda Holden, Alesha Dixon and Bruno Tonioli with his singing, all while suspended in mid-air dressed as Batman. But the mystery man's show-stopping performance appeared to have raised quite a few questions with viewers afterwards, with many calling out an obvious 'blunder' he'd made.The Dark Hero - who hasn't yet revealed his real name - took to the stage during Saturday night's episode of the ITV show to perform his own operatic rendition of Wicked's Defying Gravity - and fans have called him out for missing a trick on several fronts.