Despite the chaos going on around them because of the explosion in the hospital, Meredith has to gently break the news to Nathan that Megan Hunt has been found, alive. 'That's not funny,' he says, stunned. Forgetting to breathe, he begins coughing, and Meredith gives him oxygen. Watch this scene from the Season 13 finale, 'Ring of Fire,' and don't miss Grey's Anatomy THURSDAYS 8|7c on ABC.