In Thursday's episode of Grey's Anatomy, Dr. Simone Griffin and Trey had a heated argument about their past and future together. Meanwhile, newly appointed Chief of Surgery Teddy Altman dropped a bombshell over dinner and told Owen Hunt he would not be the Chief of Trauma. In the hospital, doctors performed a risky surgery on an artist named Natalia, whose cancer had spread to her brain. The episode also saw developments in the love lives of several characters, including Simone, Lucas, and Trey.