the301stspartanThe Hodor scene was really good even though I find it confusing.However, I really gotta wonder why they preceded it with one of the dumbest self-sacrifice scenes I've ever seen. Leaf has a grenade that explodes on impact, in a tight corridor with zombies literally everywhere behind her. What could possibly make her decide she has to walk into them to set it off?
It's not really that confusing if you look at it from a different perspective. I watched the whole scene again and a few things
Her "grenade" or whatever it is, seemed to be special and different than the others that were thrown outside before the tunnel chase. If anything, the grenade was "charging up" as it was held in her hands so perhaps she wanted to give it the biggest possible charge before detonation thus she stands there and gets ripped apart until the zombies activate the grenade themselves.
Also bear in mind that all her sisters had already died in the battle and she was the last one standing. Not really hard to understand why she would decide to make her stand there and go out with her sisters while possibly allowing Bran to escape. Leaf knew how important Bran is or can be in the big picture.
Lastly, the White Walker army of Wights are referred to as Zombies a lot and not much is known about them. If they act like traditional "zombie" type creatures from D&D it means they need to either be commanded by a more powerful creature or ,if they have no orders, they simply attack whenever they can physically see or hear at the moment. They cannot think for themselves or reason anything out. Every scene with them to date has been consistent with that reasoning.
That said, the "sacrifices" in the tunnel were just fine in context but the main difference between the Dire Wolf and Leaf deaths were that the Wights still seen other things to attack in the tunnel thus they kept coming. If you watch the scene again, when Hodor did his hold the door thing, it allowed Bran to fade into the mist so after Hodor was dead, the Wights had nothing else to see and attack.