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How about an option to enable a "relax threshold" where a hit strong enough might cause a certain joint to relax. For example a hit to the chest might cause the chest to relax (At least until the player's next turn). Perhaps it could be such that hitting a joint hard will also cause adjacent joints to relax
Also a "grab threshold" where a player's grab will be removed if the wrist/hand is hit hard enough.
I think that this might lead to some interesting game modes