or by striking him with your fist, you are guilty of murder and are to be put to death. The dead person's nearest relative has the responsibility for putting the murderer to death. When he finds you, he is to kill you.
For example, if two of you go into the forest together to cut wood and if, as one of you is chopping down a tree, the ax head comes off the handle and kills the other, you can run to one of those three cities and be safe.
If the one looking for revenge follows you there, the people of the city must not hand you over to that one. They must protect you because you killed the person accidentally and not out of anger.