Anyone who accidentally killed someone without hating him at the time of the accident could flee to one of those cities and be safe.

Now this is the law pertaining to one who flees there in order to live, if he has accidentally killed another without hating him at the time of the accident.

Otherwise the blood avenger will chase after the killer in the heat of his anger, eventually overtake him, and kill him, though this is not a capital case since he did not hate him at the time of the accident.