Grey's Anatomy Season 7, Episode 11 Disarm Drama IMDB 8.2 Country United States Duration 43 min Air Date 2011-01-06 Actors Ellen Pompeo (Meredith Grey) James Pickens Jr. (Richard Webber) Chandra Wilson (Miranda Bailey) Kevin McKidd (Owen Hunt) Camilla Luddington (Jo Wilson) Kim Raver (Teddy Altman) Chris Carmack (Atticus Lincoln) Jake Borelli (Levi Schmitt) Anthony Hill (Winston Ndugu) Caterina Scorsone (Amelia Shepherd) Overview A gunman opens fire at a local college, sending mass casualties to the hospital; Arizona's return is not warmly received.