Crushed by the wheels of industry

Obviously, hope he recovers, but how precisely did Troubled Ex-East 17 Singer Brian Harvey fall out of his car while reversing, assuming it wasn't a suicide attempt as it sounds too detailed a plan to be one? Clearly seatbelt use didn't play a part but he wasn't driving a DeLorean, so he couldn't lean on where he thought the window opener would be. Mind you he is small, so he could have gone out the window.