Well, it turns out that an external shooter would have actually caused more problems in this particular situation. This guy offed himself. I'm struggling to think of a way you could have fired your CCW and and improved upon that outcome. Nobody would have gotten to this guy before he got his victims. So, let's not even mention that.
Again, I'm pro-CCW, and I would carry if I could. So, don't misread what I'm saying.
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If you're reading this, it's too late.