I just got an idea...it struck me odd that Kakuzu didn't finish off Asuma instead of just kicking him. What if Asuma wounded himself? Would this hurt Hidan? I mean when Hidan is inside the circle all damage recieved is passed on to whom ever he curses. But what if that person hurts themselves? Would Hidan recieve the damage? I mean who in there right mind would wound themselves??? So Hidan never worries about it that much because his enemy isn't around long enough to realize it and thats what he feared the most when Shikamaru solved how to avoid the curse partially. If I was Asuma I'd cut my hand to see if it affects Hidan. Is this far fetched even for the naruverse? Love to have replies!