The 10 Worst Medical Mistakes on Grey's Anatomy

On the season 13 opener, Alex reaps the fallout for the fight between him and DeLuca. After DeLuca is rushed to the ER with a ton of injuries to his face and head, Alex and Meredith conspire (for a while, anyway) to keep it a secret. The truth comes out, but since a doctor takes a vow to "do no harm," this could mean that Dr. Karev might just become plain ol' Karev.