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I'd want to make sure the SOB was really deadexactly, the first shooting exchange (when there was a guy with a gun waving it at fellow staff) was appropriately legal for the pharmacist
Giving chase was questionably legal at best
Going back to the store to get a second gun (likely to have one fully loaded) is appropriately legal and potentially very wise in case the gunman returned
It is 100% not ok to just continue firing rounds into a guy on the ground 3 minutes after he stops moving