I'm not sure how I overlooked this. I have enough experience with AR-15s (hence the name) to know that this doesn't make sense.
Only two explanations:
* The shooting was staged. (Unlikely)
* There were multiple shooters. (Likely)
Stay safe.
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There was a guy blocking an exit door. Domino effect made it easier to just shoot a bunch of people together. People hiding in bathrooms too makes it easier. But in the end its just terrible.