In the "Have You Seen Me Lately?" episode of Grey's Anatomy, Amelia and Derek (guest star Patrick Dempsey) came up with a way to possibly save Erica's life. They will have a 90-second window of opportunity to complete one vital part of a risky procedure. Lexie (guest star Chyler Leigh) says they've hit their target time just twice during numerous practice runs. The operation needs to take place ASAP. Erica persuades them to give her a day so that she can have a talk with Mason.
During a rainy day in the park, Erica, Cooper and Charlotte finally tell Mason about the tumor in his mom's brain. He's angry that she didn't tell him sooner. Cooper's also upset, as he believes he's handled everything wrong. Charlotte assures him that he did the best he could. Later, Charlotte tells Mason exactly what's going to happen to his mom. He appreciates hearing the truth.
Erica lets Mason know that she'll always love him no matter where she is. She also has a heartfelt conversation with Charlotte to let her know that her son will need a living mom if she dies. Once Erica is wheeled into the OR, Derek lets Amelia know that the fear she has is a good thing. That's because when she's scared she fights. He's known that since they were kids.