Would a punch in the stomach, wich causes internal wounds and bleeds, be counted as drinking his own blood?

Anyway Hidan has to die by the hands of shikamaru, he has been to obsessed with it to let naruto or sakura kill him. So Im almost sure that he is going to take something out of his sleeve to defeat Hidan.

Kakuzu and naruto will collide with their best jutsu and Kakuzu and his ultimate killing jutsu will be owned (and obliterated) by Windsengan making everyone say OMFG.