Correct. Shooting for the center of mass is the commonly trained target area since, if the shooter misses a little left, right, up or down, they will still hit something. This is why the Hollywood fable telling of "shoot the gun out of their hand" is stupid. Anyone who has fired a pistol at 25 yards quickly learns why.
My guess is that Officer Salter was less than 15 yards from the WSE, quickly fired off three accurate shots before being murdered. My advice is two shots to center of mass then automatically aim for the groin area (larger than the head/shoulders area) and fire two rounds there. This tactic can be practiced at the range. Obviously if body armor is suspected, go for the groin area first. Once the WSE is down, it's easier to go for the head/shoulders. Best to keep shooting until they stop moving.
If nothing else, hitting meat will distract the WSE from murdering others and, even if they run away, cause them to bleed out. Civilians aren't required to abide by the Geneva Convention, so hollow points, soft points, jacketed hollow points, etc are legal to use and highly recommended. The bad news about such ammo is that it's great for wounding/killing, but not for penetrating windshields, light body armor, walls, etc.