Nice little piece, needs a bit more contrast though, as is things are a little flat and overall very dark. Consider that a good deal of what you are after can be done in camera with just lights and production design, rather than in AE. Is it possible to see the shot clean? (before AE).
Red on black is a great combo, but if you are going to shoot without gels and add it as a post filter, then you have to think about adjusting your exposure to compensate, especially if you want and detail at either end.
A little more separation of the talent from the bg with some edge light would do nicely, then you could move your key to be more on his mask, keeping that narrow and hard you could have him lean in and out of the red shaft of light to highlight the detail of the mask and get some shine from the blade as well. I would probably give the key a little bit of a sickly orange-red.
Going that route you could probably give just a teeny bit of fill to show something behind him. Rather than a blank wall there, hang a big piece of deep red fabric or paint some 4x8 foam core red and pretend that is the wall, or streak the wall with goo and "blood" splatter and other filth. Expose for your key light, and check that your fill gives enough background detail where needed but still cuts off to darkness where you want it.
I liked your text off to the side, although it didn't quite seem to pulse in time with the sound but perhaps that was the idea.
