Phoebe, now a Mermaid, likes the idea of swimming away from all of her problems with Cole and her sisters and that seems quite sensible considering all that she has to face. The problem being, it's never that easy and she soon finds that out when the nasty old sea hag, hell bent on revenge, decides to make life as difficult as possible.
Things aren't all that great for Piper either as she attempts to control and internalise her fears, which actually makes matters worse in the long run. But whom do they turn to for help? Why Cole, of course, who else but the ultimate evil in a situation like this?
Like I said, much better than Part 1, the writing and continuity was stronger and, therefore, far more watchable. Great episode.