[As things get worse for Merlin, Arthur will finally set out in order to find Elsa, in hopes of figuring out just what's been going on. He has no way of knowing if it was purposeful or not, if everything was a trick up to this point - and that would hardly be the first time that's happened in Arthur's experience - so he's moving with caution, his sword drawn, but moving quickly if only because he doesn't know how much time Merlin has left, and if she has a cure or a means to call off the curse, he'll do whatever he can]
[He'll eventually stumble close towards her, making his way as quickly as he can through snow and ice without, well, falling on his ass a result, but once he hits the eye of the storm, he's moving with far more purpose, knowing he's close]