What an abrupt ending for Dr. Erica Hahn's character.  

Response from exec producer Shonda Rhimes."Sara Ramirez (Callie) is an incredible comedic and dramatic actress and we wanted to be able to play up her magic. Unfortunately, we did not find that the magic and chemistry with Brooke's character would sustain in the long run."  What show was she watching? 

So change it, don't fire her!  Not another abandonment .  That Burke mourning lasted entirely too long.  If Dr. Hahn's gotta go at least give her a proper exit from the show.