Most scenario training I have either lead or observed, teaches that you need to “freeze” a hostile scene first. That is why the military is instructed to yell “HALT” and many PD departments teach officers to yell “FREEZE”. Often this is refered to as containment. I have always instructed that if the hostile complies with containment, you yourself need to force yourself into a calmer state.
The second thing that we taught was that ONE and ONLY ONE, and most likely the most senior officer present, would issue any commands. This is true in both large and small scale.
This is where I feel the LV incident fell appart. No one person took charge of the situation. This is a failure of command and leadership.
There are a couple of other steps / considerations BEFORE you get to “put the gun down” commands. But when you mess up #1 and #2, it has already gone very bad.
It's more than that.
They put multiple holes in the victim, killing him, then ya got people saying the weapon was found in the victims holster...
This would indicate ya got people on that department that lack training, and or are trigger happy, paranoid, wanna be cowboys, or are just completely incompetent.