“Doppelgangland” is the follow-up episode to “The Wish” in the third season of Buffy the Vampire Slayer. In “The Wish” we’re transported to an alternate universe where Willow is a ruthless badass vampire. In “Doppelgangland” Vampire Willow crosses over into the “normal” universe and makes things very interesting for non-vampy Willow and the Scoobie Gang.
The two twisted-stitch cable motifs represent each of the two universes. Eventually the inside cable motif splits and crosses over the wrist to join the other one, just as Vampire Willow crosses over to the other universe.