Revealing mistake: When Clint Eastwood runs to grab Gus Wheeler after he catches fire, you can see the stuntman and not Eastwood wrestle him to the ground.
Revealing mistake: When Harry and Samantha are shot at in the elevator you can see a number of the dark marbles that were used for the effect rolling on the floor.
Chosen answer: Under those circumstances, when someone has just committed an extreme act to protect themselves it would be hard to claim that the third shooting was deliberate murder, that he was thinking normally, and that there was no further danger. From Callahan's perspective, he might have believed the shooter was not actually fleeing and still posed a threat if he came back.
raywest ★