Nail's eyes focused on the figure which started to creep out from the darkness, at the same time, he instinctively placed his hand over the handle of his sword, at the same time, Korra looked at the same direction as Nail did, slightly confused at first but realizing the question at last. The figure finally came out, it seemingly looking like a human, his skin, of a pale white color with dark dots of different sizes, and randomly all-around his body, in places around his body with the same black mist that covered the room.
The face of a young boy, not older than 17, with tears under "it's" eye sockets, it's body twitched profusely, as if it couldn't control himself, the pale skin as white as snow itself, the boy seemed scared, not really understanding where he is, or what was he be doing before that.
Korra tried getting closer, but the kid stepped back the moment he noticed her movement, running away to another room, once off the move, the darkness of the room dispessed almost instantaneously, as if it was realizing that "it" may be in danger, still so, the boy's body still contaminated by the dark pitch fog. As so, Korra and Nail still avoided the hits trying to do as less damage as possible, one way to neutralize someone infected by the darkness that very few people knew was to do progressively damage so the "darkness" could disperse throughout the wounds done, but once the person was "dessinfected" of the dark fog, this would loss it's remaining memories, and be would left off only with the basic knowledge, how to speak, how to walk, his name, age... but still, no memories, that was what Korra is planning, trying to , she prefered to leave this kid without memories rather than killing him.
As so, Nail, changed of objective and decided to follow the "darkness" behind, considering it's strange actions the darkness had to be running away somewhere, with this, Nail may be able to learn something about the darkness, and why it acts the way it acts, Nail kept charging towards the mist following it close behind, on a sudden move, with a light, almost unnoticable flick wrist, 1 purely white tentacle from an octopus formed from thin air, the mentioned tentacle lengthen it's size and stuck itself to a door-frame and impulsed himself with it and mantaining his momentum.
Back with Korra, she kept avoiding the punches of the kid, which tho, were barely could considered a "punch" the strength it had was inhuman, if the hit landed in an organ or a limb, it would be able to easily torn the flesh. With the thought in mind, The eyes of Korra shined bright, as her movements started turning more precise, avoiding each hit precisely countering any chance she has, with light cuts or physical hits, trying as hard as she could to make the less damage as possible, the kid shouted, with an horrendous voice, almost as if a part of himself was being torned out off him, in some way, that was exactly what was happening.
Back to Nail, he kept following, the mist leading him towards rooms that became darker and darker, finally reaching what it seemed a long hall which didn't had any light at all, Nail was unable to feel the "darkness" pressence. As he kept walking he reached what it seemed the middle of this lengthy hall, suddenly, the lightbulb on top of him started variating with the lightbulb on and off, Nail looked up a bit creeped out, but he didn't gave it much a thought, then he saw it, in the end of the hall, a figure, slowly forming through out of that dark mist, slowly "it" becoming a sort of cloack for that figure, and as the figure also noticed Nail's presence, it turned looking towards Nail. And in the same moment Nail blinked, the figure dissapeared, as if it was never there.
Korra kept pushing, she wasn't struggling at all, it was comprehensive now why was she the leader of the hares, it was almost as if the moment the kid wanted to do a move she already knew how to counter it. Suddenly as the kid was breathing heavily, clearly tired over him throwing hits to the air, that same tentacle covered the kid's body not letting him move at all, Nail came back, leaving up a deep sigh
"I had everything under control" Korra said turning up to the man.
"I know you had it under control, but we don't have all day, and I feel like we really should leave this place." Nail said slightly tired over the mindless running session he had with the fog, that same octopus tentacles slowly turning of a dark color, as if it was sucking the darkness out of him. Once the young one had no more dark dots, they slowly found their way out of the strange "facility" and carrying the kid on Nail's shoulders.