I was wandering around, when i saw a skeleton horse. So i went up close to investigate, when lighning struck and 7 skeletons with enchanted helmets appeared. I know this may be a randomly accuring thing, but every horse i haven't tamed becomes a skeleton horse when it storms. And EVERY time i get close to it the whole skeleton spawining thing happens... EVERY TIME! I don't know if this is a bug or this is supposed to happen.