Werewolves shield their eyes during storm
It looks pretty weird, and this behaviour does not present in original game.
It is because OpenMW uses the xbase_anim.kf as a fallback for werewolves. They have no own "idlestorm" animation group and fallback to the animation from xbase_anim.kf. Morrowind seems to do not use such fallback (and it makes no sense anyway).