I have a theory about the last chapter (current if you not consider the spoiler, hehehe). It's about pains intention on stabbing little hinata in front of naruto:
When Pain stabbed hinata, I think his intentions wasn't to do it only once, but several times as naruto just looks the whole scene and can't do nothing. I mean, he wanted naruto to fell pain, what's better than making him suffer like this, watching a friend (or a potential lover, if you wish) being stabbed again and again against all the hopes? So the transformation in six tails saved her and pain just forget it as he just tough to himself like if he wasn't expecting that.