User blog comment:Miskos3/Fairy Tail Episode 160: Bad Omen, Review/@comment-109.193.88.106-20121208172305/@comment-5341942-20121208191745

I thought so too. But apparently the animators had no idea how to make it all 'lighning-like' in black so they just decided to add a splash of yellow and leave it to that, hoping it would look lightning-y enough.