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Sleeping, not paying attention, outside having a smoke, but that's the million dollar question.

Impossible, because he was essentially unimpeded with what he went there to do. He would have been stopped far sooner, and that equates to fewer victims, not more.

And yet this guy managed to shoot that many people... was he sleeping in a corner?

If there had been others fewer people would have been injured or died.

A good guy with a gun would have done done far more good than waiting for the police to show up, which yet again proves, not only that gun free zones guarantee a criminal will not find any armed law...