Gorgo and Akka - isolated far from the flock - witness an aurora borealis which scares Gorgo. Akka tells him that during this phenomenon, transformations can happen. Then, unseen by Gorgo, the old goose falls headfirst into a crevasse. Gorgo finds himself alone with a bat who was passing by and is sure that it is Akka, now transformed into a 'Werebat'.
The flock is scared by an aura borealis, even after clever Nils explains it's a natural phenomenon, with Akka insisting it spells weird and scary things, the she falls into a rock crevasse. Just then, a bat arrives, which confused Gorgo believes to be Akka transformed by black magic into a 'werebat'. Nils has a hard time setting everything straight.—KGF Vissers