Msungo

I think some people here need to work on their reading comprehension. The dev clearly states that AI does NOT get any information about Xenonauts position that it doesn't get legitimately (from sight and seeing the shots). I see a lot of people here interpreted his explanation about aggressive trigger for the Aliens as being triggered by the proximity of Xenonauts. That is not what he said, he said that every turn there's about 10% chance (so it happens about once in 10 turns) that the Aliens will be fed aggression into their routine, making it more likely that they decide to do something aggressive (because otherwise they would sit still, or have to have scripted "idle" movements). The reasoning, I imagine, is to force you to consider the possibility of them charging out of places, or a possibility of them staying hidden behind some cover, and then surprising you later because you missed to check that area before proceeding. Because otherwise, they would get no triggers to do anything, or if they could only react, it would limit the usefulness of various Alien defensive positionings. As a blatant example, without that random aggressive routine, you would have 100% easy job of setting up an UFO raid, since you would have nothing to fear, if they are holed in, they would stay holed in till they see you. Another way to solve it, but it would work only for UFO scenario, would to consider UFO having cameras/line of sight itself, but that would give too much advantage to the Aliens, and it would make Aliens camping behind non-UFO covers much less of a threat. TL;DR l2read, the aggressive "trigger" that got mentioned by the dev, is not triggered by your actions, but its a completely random chance to feed aggression into the AI behavior formula.