Specialone

Ok here's another scenario, off duty cop lets him go to spare the situation escalating, he jumps in a car and a chase ensues, he loses control, kills a family of four, he survives, justified ? Shot dead earlier, four people still living.

What about he gets away, challenged by an un armed on duty cop or have a go hero, during struggle, he stabs them to death, justified ? Cop shot him dead earlier, innocent person still alive.

Both the above are perfectly possible.