Airlock?! (Gameplay Element)

[DeltaFlame]

In the behind the scenes trailer, at around 0:45 seconds where Mark Lamia is talking about if you bought the collectors edition you get Moon, free! Well he says this over a small gameplay clip off someone backing away from zombies, shooting a gas crawler, there is an explosion and then a door behind the crawler slides shut. (note* the moving green shapes)

Also, there is a clip off the same door (at the top off stairs) that is shut? So if this is an openable door, why would it reclose?)

My guess, it's an airlock to the outside, and could be similar to the Punja Spikes on Shangri-La? Stopping the zombies for a little while maybe?

Discuss

[TescoFresco]

I was thinkning the air locks will be like the elevators on 5, as in one door shuts, then you wait a few seconds, then the one behind you opens, to give you a break for a few seconds and to get to other areas. And there is obviously going to be an airlock otherwise you wouldn't be able to get outside without alll the air escaping.

But yeah thats just my thoughts :)