Kakashi can't win this... Hanzo salamander (or gecko) can turn invisible and shoot very poisonous gas at you. If kakashi even gets a bit of that in his lungs he is dead.. No to mention if he pierces hanzo then he will get poisoned due to his poison gland. Kakashi is no med ninja, he can't fight poison even with his overrated kumai. Sure he can get rid of salamander but there goes all his chakra, same with the poison gas for less chakra but the salamander can just shot more at him. If he kumai's hanzo then he will be almost out of chakra, but what's the chance that he will do right off the bat..