These episodes hurt on so many levels. In the season six finale, Gary Clark goes on a shooting spree at the hospital after his wife dies under Derek's care. Meredith, who's pregnant, witnesses Gary shooting Derek. With the hospital still on lockdown and an active shooter loose, Cristina takes on a life-saving surgery on Derek. Gary shows up again while Cristina operates on Derek, so she and Jackson mimic pulling the plug to make him think that Derek is dead. Meredith ends up miscarrying in the middle of Derek's surgery. Derek lives, but this episode introduces us to a whole new level of tragedy in the "Grey's" universe.
