User blog comment:IamJakuhoRaikoben/Chapter 393: Silver Memories, Review./@comment-24800928-20140718203929/@comment-50.161.75.188-20140719172753

I think I can answer the first one, they either A) probably let him do it to get rid of the 'failures', B) he learned how to teleport to sneak out and kill the demons or C) They have a bigger plan in mind for him.