Michael McKinley shares Mike Minter's Anatomy of Conflict. It starts with "An offense occurs" and ends with "Many are hurt." According to McKinley, the turning point is step 5: "Suspicion on both sides develop." He says that once you get there, "it's pretty hard to pull out of the nose-dive."
By the way, #5 is not very far down the list. So please, please, please, if you're involved in the conflict, do what you can to stop the process as soon as possible.