Maybe.

But I gotta think a homicidal shit walking unmolested with all the time in the world to aim, fire, aim again, fire again, aim again, fire again . . . that's just not that much to make him think twice.

Targets lying on the floor, covering their heads and screaming don't cause a gunman as much of a problem as return fire.

I read that Cho fired up to 200 rounds. How many rounds does a Glock magazine hold? Do they have the capacity to hold 20 rounds?
That means he had enough time to wander through classrooms, reloading up to ten times.

Anyone know if that figure is accurate?