Plot hole: The sisters are preparing for a big showdown with Zankou and vaguely discussing their plan. They don't outright say it (so as not to give it away) but discuss how they wished they "had learned it sooner" but "Prue was very protective of it." They're discussing astral projection which originally was stated as a Prue-specific power and not one that could be taught. The show ignored the original introduction of the power as developing naturally as one of Prue's powers, and was not an ability that could be learned, just so the episode had a way for the sisters to defeat Zankou.
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