Ok, I did enjoy this episode though I wasn't expecting much at all.
I did find Luka kind of odd this week but then again, there is no easy way to tell someone they are fired. How do you tell someone that was here before you, that took the blame for Clemente (which was her fault), that's she's fired? Kerry used to be a really eh (not to use improper language)... annoying sometimes regarding other issues, but I think her character has developed incredibly over the past two seasons. She has been portraid more human, with real feelings not some cold hearted person.
Of course Kerry's relationship with Abby is close. She was there when she had the miscarriage, Henry was born, when Sandy died... But then again Luka was the first to know she was gay But then again we did know Luka was being pressured to cut an attending. Abby knew that... what was she expecting? She works there, she know who those people are. Someone was going to fall. The issue is that Luka is the Chief and he is the one that has to take responsability and do his job. He can't discuss those matters with Abby. If she didn't work in the hospital and didn't know the people... maybe. But she does! So it's too subjective... She doesn't have a saying on it. They need to keep their personal life outside the ambulance bay when it comes handling the ER and it's managament.
After all of this I have to say, I wasn't expecting Kerry to leave at all. But then again I think the story with the diabetic - Hurricane Katrina survivor made Kerry realize that it might be time to move on. Not because she was being forced to but because she had the choice to do something else, a choice that was hers only. She could fight and stay in the ER or be useful some place else. A choice that actually her patient didn't have. To stay in New Orleans and to keep her leg, someone made the choice for her.
When Kerry was talking about Sandy, how she died and how she needs to move on... I had a flashback to Luka and how he had to leave Croatia to move on. 
Do you see a theme here? Even Elizabeth Corday went back to England after Mark died... Wow!
Now regarding Pratt, I think Luka was feeling guilty about Kerry when Pratt gave him his news so he was more condescendent due to that fact. Either way I think Pratt should've seen that one coming when he took the meds to the Church. I think this matter isn't settled and we are gonna see more of this soon.
The whole Alex story with the credit card didn't surprise me at all. the Grandma was funny, Sam's family is all messed up too! I thought she came from a good family and she was the black sheep but it turns out that she is not!
And then the whole Meg / Gates story is making me kind of tired. Though I'm a little scared of Gates of how he reacted towards Meg, jamming her to the wall. 
Neela needs to forget about Gates and go to Ray or I might go on a strike!
Ok, I think I've written enough about this. My back is killing me... *sighs* Hope this isn't too confusing.