How do the aliens “wordlessly communicate”?
This is accomplished through a few mechanisms. Aliens can always see each other. This means aliens can really play off of each other spontaneously and without having to give orders, type, or sometimes even talk. For example… An alien is about to attack a group of marines. Just as he’s about to attack, he notices another alien crawling through a ventilation shaft towards the rear of the marine base, and so he waits a few seconds instead. Then, just as the other alien is about to emerge to flank the marines, he decides to attack simultaneously from the front. This will promote coordinated action by the aliens, but without forcing them to stop and communicate. Aliens can also use the pop-up menu to communicate certain messages.