The Night King didn’t have any power over Uncle Benjen, either. Uncle Benjen was attacked by the White Walkers and left for dead, but one of the Children of the Forest found him and stopped him from coming under the control of the White Walkers. Benjen then became an ally of the Three Eyed Raven and the Children of the Forest.
Wow, I missed that one too. I’ve read all the books twice or more, and didn’t grasp it. All I knew is that Benjen was pretty ‘enigmatic’.
Although I have missed a couple of the shows, and didn’t pay close attention to a few others while they were on.