Don't be a moron. He could have been shooting from a concealed position, from within a building or with his back and one side completely sheltered in the corner of buildings. The victims were lined up outdoors to get flu shots. They could have been mowed down in a split second.
Reports say he stood over some of them and shot them. The CO of Ft. Hood said he was very methodical in going from one to another.
Why would you call me a moron? Just because I feel differently about something, something that has a lot of explaining left to come out.