Authorities in Philadelphia say they aren’t sure why a man walked off a subway but a close look at the video seems to suggest he was distracted by his phone. The capture above shows there’s something in the man’s right hand as he cluelessly walks along the edge of the platform and then puts his foot where there is nothing but air. Down he goes and the injuries appear to be serious. He may have a broken back. In the video below a courageous fellow commuter jumps onto the track and some go running for help. But others are hardly worrying. Take a look.