A lifetime of training to know everything he could about how to use his body as a weapon meant that Sasuke had to know its status and location at any given time, and that coupled with his natural disinclination for touch meant that he was finely tuned to the presence of other people. Mostly because he hated it.

Just a few days of being blind had only made the irritating prickle of someone in Sasuke's space even more annoying -- Aidou's first move had made already Sasuke suspicious. The second faint movement of air came even closer and Sasuke reacted before he could think about it, left arm snapping up to defend against even the potential of an attack.

So maybe a blind Sasuke was also a paranoid Sasuke, but the defence collided with what was definitely Aidou's arm, and Sasuke directed a vehement glare in Aidou's direction. Whether it was an intended attack or not, there had been a deliberate movement towards Sasuke's face, and that was not something necessary outside of combat. (Unless it was River, but Aidou was weird, not completely unbalanced.)

"The hell?" He demanded, voice flatly annoyed. Kakashi testing Sasuke was one thing -- the man had a right and likely moved more subtly than Aidou any day -- but Aidou being a brat and interrupting a useful conversation was another.