That sounds similar to the problem a number of people have reported with both rain and freeze active at the same time: a character being able to move at 0 AP but unable to do anything useful and the turn never ending as a result. I'd hazard a guess it's the same thing, and a reload from an earlier save seems to be the only fix at present.
I'm slightly wary of that area in general, though: there seems to be a number of bugs that have been observed there.
