So far, Grey’s Anatomy Season 9, Episode 18: “Idle Hands” seems to be centered around Meredith and Derek’s baby, but in this sneak peek (via Spoiler TV), the father-to-be isn’t protecting his wife — he’s saving his intern!
As Shane tries to deliver not-so-great news to the father of a patient, the man gets violent, lunging at him. But what does Derek do to stop him? You’ll have to watch the clip above to see the heated intervention.
Catch the next new episode of Grey’s Anatomy on Thursday, March 21, 2013, at 9 p.m. ET/PT on ABC.