A robber shot an unsuspecting victim inside a Bronx subway station but the stick up backfired when the victim fought back, grabbing his assailant’s weapon and shooting him in the face, law enforcement sources said. The 21-year-old would-be robber pulled his gun on a 40-year-old man in the mezzanine of the B/D station at E. 182nd St. and the Grand Concourse in Fordham Heights, said authorities. Jeremy Lynch, a neighborhood resident, was inside the station near the token booth when the struggle occurred on the other side of the turnstiles. “I heard arguing. I took cover,” he said. As the...