After the first contact in history with an alien species, it was discovered that they were colonizers, which approached us to induce, as they called it, the "Next step to evolution". After their attempts on forcing the world's governments to change to resemble their own, a series of conflicts happened. Understanding their efforts were being wasted, they decided on another approach, releasing a bioengineered pathogen that infected a fraction of the human population. These infected are mostly like any human, with two main differences important for this: their skin is impenetrable to all kinds of weaponry and they can alternate between their human form and a more combat oriented one, this however is not under their direct control, being dictated by their subconscious instead, which they'd learn to control as well as possible to control their own appearance.
In this situation, could these infected humans truly have good control over their subconscious? To which extent can one have control over their own subconscious?