The plot here is somewhat of a sci-fi/horror staple: an isolated location (base) and monsters at (or inside) the door. Many shows and films have done it, but in particular Zygote brings The Thing and Alien to mind. The delivery is simple too; after some dialogue in a contained room to set the scene, two survivors must try to make it across the base to the point they can escape. At first the dialogue was a little uninteresting, but as the film goes on I realized that this opening scene did add a lot to the film. Okay it is direct exposition, but the short running time doesn't give you the freedom to let it play out another way, unless you use a narrator in the same way as Rakka did, or a similar device such as the opening footage of Firebase.
This opening scene does ask a lot though, because in addition to the exposition, the male actor is not particularly strong – feeling a bit forced and trying too hard to do what he is doing. Once the beast comes though, the film takes on a great pace and sense of horror. The beast itself is a horrific and chilling piece of body horror; the CGI feels real in the way it moves (and moves not just as one creature, but as a horrid composition of people). Through the escape, there are scenes reminding us of what we already heard – and there is a real horror here which the film does well to link to even if it doesn't have the time itself. Fanning is good in the lead, convincing in her fear and limits.
As with the other shorts in this Volume 1 of release, it doesn't feel like a whole (because it is not) but at the same time there is more than enough here to make it effective.