As soon as the Helicarrier moved away from the frontline, new cargo planes started to emerge from the night skies dropping a certain set of items as it flew across the Western Forest. Without a doubt, those items were none other than the flying turrets and set of nets that came with it. The nets were multilayers to the point where they would block out almost 90% of moonlight.
Not to mention, because they were flying turrets, they also had the capacity of carrying a few ammunition clips on them as well with an automatic rifle attached to them. In short, this multi layer net was not just to block out the moonlight but its also used as a deterring weapon which these turrets would shoot if any monsters were within their proximity.