It does mean that the assisting officers aren’t required to actually confirm their target, though.
What if this was real. If a 3rd party shot at them. 1st officer fires, blindly assuming it’s the perp in cuffs in the car. 2nd cop shoots and kills perp in car because he saw that’s what his partner was shooting at. When, in this hypothetical scenario, it was really a 3rd party that wasn’t identified yet, which would be the only plausible source of a gun shot anyway since the perp was already searched and cuffed.
That doesn’t make sense to me, but that’s how they’re trained. Ride or die with their comrads. Once the first shot is fired, it’s shoot first and ask questions later for all additional officers.
That’s not good policy. That’s not good for civilians.