Quote Originally Posted by DJZen
You might be thinking about the beginning of the game where Cecil whips out his dark knight powers in the intro, then suddenly loses them for no apparent reason.
Cecil uses a Red Fang and a White Fang in the intro to FF4. He never uses Dark Wave.

If you're playing FF2/4j on the SNES, in English, then you're playing the moron version. Square removed a bunch of commmands and items, and lowered the difficulty, so we stupid Americans wouldn't get all confused.