Since the animations of this game are wild and unreadable, backstabs dont work properly.
Because the upperbody twists and stretches around, making it impossible to know where to backstab enemies.
Reworking all animations would simply take too much time, eventho some should be reworked for other reasons anyways.
The best and easiest solution would be to set the backstab window to direction of the feet of enemies, because they dont turn and twist for the most part.
Then you dont need to increase the backstab window, which could make it too easy.
You simply look at the feet of enemies and know exactly where to backstab.
I hope this will be implemented and fixed.