Bubble Gun: One of the contractors working with Claude uses a pipe to blow bubbles that explode like bombs. Not the most reliable power in combat, but it certainly gets points for flashiness. Hei responds with a somewhat more direct attack: a knife to the forehead.
Hope Spot: Yin declared a place they were hiding to be safe and it was starting to look like they could stay there for a while. Then "Amber" showed up.
And again in the third one, this time on a broader scale. Amigiri had gathered a bunch of survivors of Evening Primrose and Contractors on the run from the Syndicate in a hidden safehouse community. Hei actually smiled. Naturally, Claude killed pretty much all of them to get to Yin.
Invisibility: One of the Syndicate contractors from the opening sequence boasts this ability, which would seem to make up for his rather portly bearing, as he only needs to get one strategically placed attack on an opponent. Hei, however, thwarts him with an even more strategically placed Facepalm.
Just A Flesh Wound: Apparently a foot-long spar of wood through the shoulder doesn't slow you down once you've managed to pull it out.
Hei also stabs himself in the arm to break through a Master of Illusion's hold on his mind. He doesn't even have a bandage in the episode after.
Not Herself: Yin starts actually talking, saying more in a couple of minutes than she had the entire rest of the show combined and being a bit of a jerk about it. And then it turns out she doesn't remember saying anything...
Power of the Void: The black contractor who attacks Hei at the hotel has the ability to erase all the matter in a large sphere around his body, leaving only empty air. By contractor standards, he's come out pretty well in the Superpower Lottery, too, as he has one of the most trivial remunerations in the series: he just has to crack his neck once after each use. However, he's presumably Killed Off Screen by Hei in the Gaiden's first episode.
Trauma Conga Line: The ending seems to be intended to try to convince fans still bitter about Hei's second-season characterization that yes, our hero has been through enough crap to change his personality radically. Whether this works is hard to say, but he certainly got enough emotional damage for a lifetime.