I regret not, madam. No keyhole appeared and the Elements seem to have returned to their state prior to activating. The statue from whence the... mare Nightmare issued is gone, though. I understand it took some time before the first keyhole to a new world appeared. I don't believe the cause for delay was ever ascertained. Master Sora indicated that in his time here prior, keyholes appeared just after he had defeated large enemies such as the one we encountered.