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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The shooting wasn't over in 7 mins. The text messages from to guy in the bathroom to his mother prove that. There's 23 mins between his first and last texts. So that means there's at least 23 mins between the start of the shooting, if he sent the text right when it started, and when he was shoot, if that happened right after he sent the text.