Grey's Anatomy, Season 11

Richard:
You have it in your head that he's better than you, but it isn't true. I've seen him standing exactly where you are now, staring at an impossible spinal tumor, terrified, unsure where to go next.

Amelia:
I know that tumor. They've got it hanging on their bedroom wall. Not the actual tumor.

Richard:
He found a way.

Amelia:
Yes. Which is why I need him here.

Richard:
Shepherd, I can tell you right now what would happen if I called your brother. He would hop on a plane and seven or eight hours from now, if she hadn't already herniated, Derek would come in here and he would take this surgery, your surgery, away from you and then he would kill her because this is your plan.