As the city of Bor fell into chaos, Lual Alier watched a fellow teacher pick up a Kalashnikov rifle and kill a shopkeeper. Then the man turned and began firing at him, too. “He wanted to kill me, but I ran into the water,” Mr. Alier, 28, said. What left him in shock was more than the violence and the threat to his life. Until that moment Mr. Alier thought that the two, who came from different ethnic groups but went to a teacher training institute together, were friends. They lived together “as brothers and sisters,” Mr. Alier said of the two groups, his disbelief evident as he stood beside a tree that was now the only shelter for his extended family of more than 30 people. As the halting talks to end the conflict in South Sudan finally got underway on Friday, international negotiators […]