Yeah it's his cape. But I still think that he is grieving because Rachel got off'ed. I mean, clearly he's upset, and the Rachel-character is the only one (apart from Alfred!) that Bruce has any sort of meaningful emotional connection with at all. I'm reminded of Jonah Nolan's comment about this film: "Things have to get worse before they get better." And I don't think he's alluding only to Gotham: rather, he's speaking about Bruce Wayne. I mean, the whole Mommy and Daddy getting wacked is good, it's canon, but I think in this film, Batman's whole revenge-ethos thing will work better if he loses the only other person in his life that he really cares about -- and it will make his relationship with Dent more believable after he becomes Two Face, because they both suffered the same loss (I'm assuming Nolan's Harvey isn't the hit-it-and-quit-it type).
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