Homicide: Unjustifiable, Described as Killing by Accident

…or without looking drops a heavy stone that kills him, but he was not an enemy and did not intend to harm him,

If he goes into the forest with his neighbor to cut timber and swings his axe to chop down a tree, but the blade flies off the handle and strikes and kills his neighbor, he may flee to one of these cities to save his life.