I want you to go outside and try to run like that.
No, really, I dare you. Don't forget to hold a stick in your right hand.
Over-exaggeration is one thing, but this pose is awkward. A ninja would not be awkward. Turn his left hand over. Turn the blade up. Turn his right hand over.
And I don't think the bounce on the right one is better, the left one looks more stable for drawing a weapon.