Originally Posted by The Postmaster General
I kind of took Alfred's departure a bit differently than others' from what I can tell. What I felt happened was that Bruce blindside fired Alfred, when Alfred was essentially just giving him the same parental stuff he'd always given Bruce. He kind of bluffed Bruce to some extent and got called out on it because Bruce was pretty far gone at that point. I mean to say, all Alfred really said was that he wasn't going to stand there and watch Bruce to that and then Bruce was like "Oh, well you're fired." (paraphrasing) I thought that made the scene especially gut wrenching because it sort of showed how Bruce was willing to do whatever it took to save Gotham and Alfred just got hurt in the middle of all that. Alfred has been stern with Bruce like that many times in the past and Bruce is usually either does it anyway or he compromises or takes Alfred's advice. What he doesn't do is fire his most loyal companion. Maybe I'm Donny-ing on this discussion and am misreading what's being said (I am the walrus?) but I don't think that Alfred really abandoned Bruce at all.
That's my interpretation of Alfred's departure too. Bruce bitterly told Alfred to go away and Alfred reluctantly left, with tears in his eyes. A sad and, in my opinion, powerful scene.