Dramatic video of principal stopping school shooter

Tonight, new video of the heart-stopping moment a gunman walks into Pauls Valley High School in Oklahoma. You can see a pistol in hand, but watch what unfolds next. Principal Kirk Moore in the blue shirt emerging from another door and tackling the suspect identified by police as 20-year-old Victor Hawkins, a former student of the school.Just feet away, you can see a young person slip out during Moore's fast-acting efforts. Authorities say the principal was shot in the chaos, but managed to get the suspect t ...