Yes, I was thinking about that.
The whole fighting part of the game should be close to realism of a martial arts clash of two fighters.

What happens in a fight? They sure don't look like stuff we see in movies.
First; they don't last for ages, where fighters block each-other constantly like they can predict every move of their opponent. That's just choreography.

Real fight between two martial art fighters would probably last no more than 10 minutes. Someone would be hurt really fast, and that who would be better at predicting and know how to manage in a situation would probably do few hits with no blocks that would devastate his opponent, no matter what kind of endurance he has.

So, injuring someone in a fight, braking his arm or leg, would basically mean end for that poor fellow. There is no way that guy with broken limb could be threat to his opponent.
If he would continue to fight in that condition he would only be hurt even more.

On the other hand, open wounds like cuts and bruises would be just a nuisance for trained fighter, under all that adrenalin he would still be able to fight. While strained muscles would had mayor impact on his moves and ability to prolong the fight. Hi 'skill' would suffer due his inability to do some moves impaired by muscle strains...

Internal bleeding is even worst than broken bone. You are just closer to death.

That's why this game has:

- power of the punch / kick that has three 'strengths':

low (when punch / kick is blocked)
medium (when you hit opponent but not in full strength, it may be due his constant moving or because you didn't execute your move how it should be) and
full (when you executed your move perfectly and it wasn't block by anything)

So, depending on the fact that your full strength move landed on the target, you can devastate someone with that one good punch / kick.
If it lands on some critical parts of the body or organs, you just have swayed fight toward your win, eventually or instantly.

For example, lets say that two fighters are fighting in different styles of wushu.
One of them just had very bad card to respond on his opponent's attacking card, so he suffers an injure - strain muscle of his right leg.
Momentarily, all card moves that, to be executed, use both legs, are -25% ineffective. (25% because 100% = both arms and both legs)
So, lets say he risk it (because he doesn't have any other card at that moment in his hand) and plays his move even while injured, and because of that fumbles and make an opening for his opponent to attack him and lay a full strength kick to his lower body part, hitting him on target (liver) and causing internal bleeding due to a power of that kick.

Fight is over.

Situations like that would happen in this game, and when you manage to make some advantage, causing an injure to your opponent with some good card played at the right time, it will put a strain on him and make harder for him to win. Just like in real life.

On cards, on the image of a move, there are red spots that show which limbs you need to execute them. If all of them are not injured, your move is fully effective. If some of them are, your punch / kick will be in lower strength than usually. So, basically, you lose a full strength hit option, so you are limited to low and medium.
You can still do damage like that, and with few hits on the soft spots of your opponent you can still beat him, but your task just became much harder with your injure.