Excellent work!
I remember when I used to enjoy your 3D animations and Knox's claymations and move parodies and such and even the Numa Numa guy before youtube was ever created! Also remember we had a very small amount of those AMV things and thankfully they no longer appear. This was a great little noir short. This kind of feels like a trailer too, if this was a movie I would be interested in seeing it if the premise was a killer who was invisible for some reason.
As far as audio goes I would say that all went over smoothly since it paints a picture that this would be a little dark and possibly even have dark or dry humor in it as well. The gun shot was nice. Excellent voice as well, sound like you could be perfect for doing narration of these films at the same time.
The story seems to be he's invisible and yet people wonder who is. He then questions them asking them if they really think they should know or not. He's an invisible killer but does he work for someone, is he freelance, or does he just do what he feels would be right? Interesting and makes you wonder what the full film would be like!
Since this live action it was actually quite good in quality since I've seen a few others a bit larger in file size but lower in quality. The black and white effect makes this very neat to watch like you were possibly watching an older styled film.
The outfit of the killer was pretty neat. What effects were you using or what were you wearing to give that effect when you began to apply the effects to it? You could still see his outlines too but that's still good since I doubt most people would be able to see him in that film. The smoke getting wavey and all that when he inhaled it was pretty weird to watch, at least it was to me.
Overall, I thought this was a pretty interesting little short. Would not mind seeing it made into a full film, give a back story as to how he became invisible and everything. Great short. Hope to see more from you. Great short noir!!