bobinator said:
I don't think it's an inconsistency, at least not until later on when they're able to fly one over the wall.
I think this is the Night King testing the defenses. He knows they can't cross the wall, but he's seeing if he can reanimate a body on the other side of the wall (and maybe kill a bunch of the Night's Watch in the process).
I don't think it's a big jump to think that he had a WW relatively close by to raise them at night in the castle once they were through the wall.
So I think all of that was actually a decently well thought out plan.
My opinion is that the magic built into the wall prevents the White Walkers from crossing the wall, but not the wights. Presumably, wights could have climbed it and attack the north during previous winters, explaining why the wall was 700 feet high and the Night's Watch was created. That means the wight that they brought through the wall in season 1 was just "napping" (there's a precedence that the wights can go quiet for extended periods of time) and the wight they flew over the wall was fine too. Also, this would be consistent with Benjen because there was no effort to turn him into a wight, they tried to turn him into a White Walker, thus, preventing him from going over/through the wall. Clearly once the foundation of the wall was destroyed, so was the spell.
I know that would be contradictory to the CotF's magic in the 3ER cave, but there's no reason why the CotF couldn't have a different kind of spell than the spell that was built into the foundation of the wall (presumably by Bran the Builder who isn't a CotF).
We can all agree that Cold Hands and Benjen were combined into the same character for simplicity/casting purposes by HBO