The Chief has paged Alex and they talk outside in the hall while she knits. Other than her last hopeful look at him when she met with Derek, it seems she never notices him when he's outside, even when he's staring at her. She must have that "anti-boyfriend" glass in the windows. The Chief has a delicate and personal question for Alex, so he trips and stutters all over himself as he notes that Izzie is having her eggs harvested and that Alex is her current partner. Frozen eggs apparently have a better survival rate when fertilized, and then he stutters that this is a lot to consider. Without having to say what "this" is, Alex asks him for the cup, startling the Chief with his directness. He asks if Alex wants to talk to Izzie about it, but Alex wants to just have his special moment alone with the container without any more questions.
Callie watches Cristina work away and then walks over to Mere to ask if she is okay. Cristina has said that she is but Mere (and clearly Callie) don't believe her; Callie then turns and gives Mere the heads up that Hunt is coming down the hall. Mere is serious about her role as protector and just steps in front of him, blocking his way to her friend. Cristina doesn't notice, which is good because I think she wouldn't be happy at the idea of anyone playing bodyguard, no matter how well-meaning. But Hunt just stares at Meredith and notices Callie glaring at him as well, and after a moment he walks away. It's kind of funny that there hasn't really been any mention of PTSD by name up until this point -- yes, it was something horrible that he did and it absolutely can't happen again, but at the same time there's a very real reason that this happened and Meredith treating him as a run-of-the-mill wife beater doesn't seem quite right either.
But even if we aren't calling it anything, it's certainly there. Hunt goes up to the helicopter pad to help Derek with a patient and when he sees the blades of the chopper he starts to go into a trance like he did the night before. He doesn't strangle Derek or anything (which is a bit of a shame) but just stares vacantly and starts to breathe heavily. Derek comes over to grab him and notices that something is off -- it takes him calling Hunt's name a couple of times for him to snap out of it. He takes off and Derek meaningfully watches him go.