This skin is upside down.
Quite simply, every class uses a dagger point down. the kama would be used pointing out of the top of the hand, not the bottom. This has the effect of making most classes look as though they are punching, or otherwise badly misusing this weapon.
Simply flip it to be “blade up” and nearly all the animations will be fine.
I don’t buy that this is impossible, or likely even hard, as you could have an “invisible” weapon held normally, and the kama model flipped and attached to the hand point on the skeleton.
This skin looks amazing on your hip, and stupid when used.
What are the odds we can get that flipped around there Anet?