"Aggressive action by a determined adversary can be stopped reliably and immediately using a handgun only by a shot that disrupts the brain or upper spinal cord.
"Even the most disruptive heart wound cannot be relied upon to prevent aggression before 10 to 15 seconds has elapsed.
"Given this limitation, massive bleeding from holes in the heart or major blood vessels in the torso causing circulatory collapse is the fastest and only other reliable mechanism available to the handgun user."
Dr. Martin L. Fackler, Colonel, U.S. Army
That's the story, I think.
In the case of the big man walking with the stick, even though the officer was walking backwards, the target was large, close, and moving slowly, and the ofifcer was shooting rather slowly. It is rather apparent that it simply took 12 hits to do the job.
In the case of the man with the knife, he too was approaching slowly. and he had come very close before the officer finally fired. There is no apparent reason for concluding that the officer's shootingwas not sufficiently precise.