Not bad for the 3d beginner, mate.
But maybe you should try Garry's Mod?
Being oldschool is admirable, but there are lots of tools in this world, which exist solely to make the animating process easier.
GMod has some of them too, if you get what I'm sayin'. By using said tools you can make your fight scenes a bit more INTENSE and FLUID.

P.S.: If that was GMod all along, then two things:
1. Nice to see fellow GModer
2.You REALLY NEED to get yourself "Easy Animation Tool" and "Ragdoll Mover" tools.
Because, trust lil' ol'me, pure stop-motion really hinders fighting scenes. And makes them quite a pain in the ass.
(Geez, I sooo hate typing in caps, I just wish there was a bold font in here...)

Not really impressed by the progression of the fight but still a cool idea.

dear AntagonistDC

Garry's mod huh? Well nice of you to upload it here as I personally haven't seen a Garry's mod animation on newgrounds for quite some time. The animation was pretty good and was well made even for a garry's mod animation. Usually when I see a garry's mod animation I would expect just random, nonsensical, surreal twisting and shifting of models into ungodly ways just for comedic purposes. However I've spotted a lack of graphical effects though especially in parts where it needed but despite all of that, well done, it felt like they were actually in a fighting game similar to Proxicides MK vs SF, But without the 3D perspective.

PS: This review and all opinions are solely based on First Impressions

Regards from a Struggling Youtuber
Etriuswimbleton