"What Police meant to say was, "People with concealed carry licenses pulled their guns saving many many lives but caused the evil criminal to panic and run away. Unfortunately causing a delay in their investigation". Now I understand the true story."
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As of this writing, no one has figured out his motive (if any). Did he plan to shoot a lot more people....and did he get "nervous" if he suddenly wondered if there might be other armed people in the store besides himself?
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Did he see something? Did he hear something....like someone "rack" a weapon? Perhaps we'll know more eventually.