which past shooting mirrors a scenario where the person calling for police help is shot by the responding police?
You kidding right, there been numerous cases. Just in the last year.
Guy in Chicago called police 3 times for help, when they came they shot him.
The therapist called police for help looking for a mentally ill patient that had wandered off, police came and shit him.
Barring the simple fact anther unarmed person just gets blown away no questions asked