In other words, if an officer is taught by his department to fire his weapon at a man who has stolen his taser even if that man is running away while firing that taser at the officer, should that officer be charged with a crime for following that procedure?
It sounds like the officer did not follow his training. The taser was disabled and the cops knew it, they knew Brooks was otherwise unarmed because they had searched him, they knew he was not a threat to public safety, he was running away so he was no threat to the cops themselves, they had his ID so could have picked him up later, and they endangered bystanders when they fired, even hitting another car in the parking lot.