Well, that would pretty much explain my experience in applied combat jujitsu. I teach in China, but I'm a big white guy, so every mugger in the country thinks I'm a rich tourist. I occasionally do have to tear somebody's limbs from their torso.
(It's actually very easy to shatter bone, if you just remember some basic physics and biology.) From a third-person perspective, it pretty much looks like 1. get very close, 2. reach out and grab target, 3. target falls down, usually falling somewhat in my direction, hopefully taking some damage in the process. Of course, when dealing with muggers and pickpockets, the next step usually includes kicking the crud out of them on the ground while I go for a folding knife, and then looking to see how many more are coming and from where. (Much like the river pirates in this game, real robbers seldom work alone. Unlike this game, when real robbers start taking casualties, they usually remember previous appointments and vanish.)
Anyway, get close, grab, target falls down - shouldn't require much in the line of new animations. It happens a little slower than a gravity fall (like being run over by a horse). Do note the "get close" part - unarmed moves are always at the mercy of any weapon with reach. An unarmed attack on an armed opponent is 99% suicide, even if the unarmed party is wearing armor. (I'm thinking of modern police vests here, but I doubt my suit of O-sode Do-maru - currently under construction - will do any better.)
Most knife attacks are also this type of move - grab with forward hand, pull off balance, knife, push to ground. All the formal studies of tanto-jitsu were that way, as well as the way modern prisoners and thugs fight with knives. (Only the martial arts from the Phillipines, based on old Spanish rapier fencing, actually try to lead with the knife... and they get carved like turkeys on the street.)
Might not hurt to script the short blade attacks the same way, if somebody is actually planning to do an infighting script.
I wish I was talking from theory and not experience.