Doesn't it just? I'm afraid it's one of those times where the monster attack is the least interesting part of the story. [Ie, fortunately for Smith Puck doesn't find that part fascinating enough to elaborate on, or he would regardless of her level of interest.]
These force fields specifically? Not a thing. [He's done his fair share of setting up force fields outside of this world, but well.] Unfortunate side effect of the wardens' need-to-know basis policy and not being able to take a look at the outside yourself-- or the machinery that keeps this bubble of ours floating, for that matter.