An “enemy” is one who deliberately avoided speaking to the victim of
“accidental” killing for three days. An “enemy” is not exiled, because
he can't claim accidental killing. Rabbi Yose says that an “enemy” is
considered forewarned and is executed. Rabbi Shimon looks at the
circumstances of the case.
There were three cities of refuge in Transjordan, and three in the land
of Canaan. Direct roads were constructed to facilitate getting to a city
of refuge. The court would provide the accidental killer with two Torah
scholars, and they would try to dissuade the avenging relative from
wishing to attack. Then the court would bring him from the city of
refuge and determine the degree of his responsibility.
Art: Pieter the Elder Bruegel - The Parable of the Blind Leading the
Blind 1568