Any hints/tips to improve my fight-scenes welcome...
By the way, are there "fight-motions" based upon 2 characters?
So kinda character A acts-motion + character B reacts-motion...
Really good, toystorylab. I find it very difficult to coordinate the characters in a fight scene so they both seem to be actually engaged at all times, rather than just waiting to be punched or kicked. You did a good job with that.
Mixamo has a few of the A-B animation clips you asked about, but they still require a lot of tweaking to get them to work.
As far as tips, I have found that adding in a few grunts and groans helps sell the action better. And definitely facial expressions are helpful especially if you can squeeze in a quick closeup or two.