This was not the first time Yao Yuan had used his Homo Evolutis power in combat.
He had the unfortunate experience of doing so during one of his previous missions at the space station.
Of course, he didn’t know he was using his power then.
The truth of the matter was that the central Homo Evolutis experience, which was the suspension of human senses, especially that of sound, was not something that was uncommon on the battlefield. At the height of combat, or even when one’s life is seriously threatened, many reported the sensation of having lost the feeling of pain, and that of hearing. Some said in those situations that one could barely hear oneself.
This is a psychological phenomenon that is widely reported on. One doesn’t truly lose the sense of sound or pain, but rather the trauma one was under was so overwhelming that it shut down those senses.