"Time Stops" is the 23rd episode of the 11th season of "Grey's Anatomy." It aired on May 7, 2015.
Richard, now serving as interim Chief of Surgery since Owen resigned, is giving his famous first day speech to the new round of interns. It’s also Richard and Catherine's wedding day, and while it starts out great, it quickly turns sour when the couple begins to fight.
After Meredith decides that she can’t save a patient, Amelia asks her when she knows that nothing else can be done to save them. She continues to berate Meredith about how she let Derek die without calling her to save him.
Richard postpones his wedding. Jackson tells Owen that he and April aren’t on the same page since her trip overseas, Alex and Jo hit a rough spot and Maggie receives bad news from her mom.
Being the new her, April brings one of the trapped patients (still in his car) to the hospital.