I think the running-round-clutching-guns bit was an attempt at building suspense (required for horror to have any chance of working) and the Owen character change was simply a sloppy piece of writing.

I didn't see the very end of last night's - the scene where a naked Owen told a half-dressed Gwen "you can now" was just too vomit inducing. I don't suppose I missed much.

And I decided on seeing the first two episodes that they had done the sadly all too common thing of confusing "adult" with "smutty adolescent".