That is, those of us who aren't SWAT cops in Framingham, MA?
“As he stepped to his left, (Duncan) lost his balance and began to fall over backwards,” the report states. “Officer Duncan realized that his right foot was off the floor and the tactical equipment that he was wearing was making his movements very awkward. While falling, Officer Duncan removed his left hand from his rifle, which was pointing down towards the ground and put his left arm out to try and catch himself. As he did so, he heard a shot.”...and by "heard a shot", he means "pulled the trigger because his finger was inside the trigger guard where it damned well shouldn't have been and everybody knows it".
So this guy violated Rules #2 and #3 and an innocent man is dead because of it. How do you suppose this scenario would play out in Framingham if the shooter had been Joe Homeowner instead of Johnny Law?
(H/T to Unc.)