I can almost believe these two are the same, but not quite. ("he some reason"? "she for some reason"?) After all, if you can't use magic at the pool, how would you be able to dispell them in the first place?
Of course, dispelling them doesn't even go with Pandora reaching for a silvery object, which is presumably the combination thing. (Reaching? If she forgot the combination, wouldn't that mean she had already reached it?)
So let's assume that Radium has edited Pandora's story to be dispelling instead of a combination. In that case, the pool must have been new, and Pandora forgot about it being rabid while testing the chains.
And that leads us to the conclusion that this is not Pandora at all, but some random skeleton who happens to be trapped by enchanted chains. Either that, or Uberbob's memory of Araches' story is inaccurate. Or using a combination lock counts as dispelling for some strange reason.

Meanwhile, the party shouldn't be in any danger. The chains seem to be there for the sole purpose of holding the captive(s) underwater long enough to drown them, as none of the skeleton's bones are broken. About the only problem is that they're stuck.
And so, Fawriel should try eating some noberries.