Those green leaves are from Second Chance activating.
It's Night of the Dark Dream.
Speaking of bgms, I wonder if there's a reason why they went with Organization XIII-themed songs for chi's credit roll, it starts off with the Cavern of Remembrance theme and then to Another Side, Another Story.
Speaking of music (since I still don't have sound on my PC), which track do they use for the actual general Keyblade War scenes (not the Foreteller fights)?
Black Powder or Fate of the Unknown perhaps? Or something completely new?