I guess Tywin is going to rat Jorah or something like that with that quill and paper he asked. In the books it`s Arstan Whitebeard who points Mormont is a Vary`s informer, just after he reveals himself to be Barristan Selmy. He says he had to hide his true identity from them because Jorah was working for KL, and comes out only after Jorah recognizes him. Since in the series Selmy have already revealed his identity and the small council already know about his association with Dany, that leaves some questions: - Selmy was in the small council before Joffrey`s coronation. How didn`t he know Mormont worked for Varys? If he knew, why didn`t he tell Dany?