Rob has it summed up. The Girls are loosely following Doug's path through N-dimensional metaspace, but being 3-D themselves (well, mostly), they can't follow the path exactly. Plus there are other issues involved, such as the known existence of more than one Bob Schroeck writing stories about them in more than one universe, none of whom apparently are getting the whole story down right.
-- Bob
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Then the horns kicked in...
...and my shoes began to squeak.
-- Bob
---------
Then the horns kicked in...
...and my shoes began to squeak.