Board Thread:Character Discussion/@comment-28162607-20180101191335/@comment-25536775-20180120002054

Avatar Beta wrote: Yes he did. Issac admitted to it when the Apprentice confronted him.

The only interaction between the Apprentice and the Author I found was on 4x17 (https://www.youtube.com/watch?v=EYxJp4BDJmA). And basically the Apprentice said Isaac had controlled him, not Snow and Charming.