Originally Posted by SkyeDawn
Just curious, why were they out during such a big thunderstorm?
As long as the horses had access to shelter, there is no need to confine them inside a barn just because there is a storm. Even with the horse having a history of "getting nervous easily" - that does not specify that the issues are specifically storm related or that there was an indication that the horse might go to this extreme. I would even go so far as to offer that a horse that does become anxious, reactive, etc in a storm would be at risk of doing more damage and harm to themselves locked into a stall than in an open area.