Slade kills Ivo, but his rage is uncontrollable. He decides to kill Oliver, cementing their feud. Why 2x15 is Pivotal
Oliver realizes Slade knows about the events on the island, breaking the trust they once had. The Past: The Island Flashbacks Arrow: 2Г—15
Oliver, attempting to protect Slade from the full truth (that Sara Lance was chosen over Shado), allows Slade to believe Ivo is solely responsible. Slade kills Ivo, but his rage is uncontrollable