Michael Dion is reportedly "on life support," after spending about a half an hour being crushed between a 4 train and the extendable platform at Union Square, but nobody has been able to figure out just how he got there. His brother told the Post, "We know absolutely nothing," and says police are reviewing surveillance footage. Though the station features signs warning of the moving platforms, a few straphangers expressed concern. "You come here to take the train, not to get crushed by the floor," one told CBS 2.