shotspotter automatically analyzes the sound to differentiate between lumber slapping on the ground from fireworks from muzzle blast. it's not 100% specific so there are false reports, but it's automatic. every police unit in the city can know instantly where a shot may have happened. that's a minute better than the best citizen calling the whitest operator alerting the appropriate precinct. this guy casually strolls into the street before breaking into a run. i think he knew that woman who scurried away wasn't a huge problem, and he had time.
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