Season 4, Episode 8: The Mountain and the Viper
Dany exiles Jorah, forgetting everything she learned in the last episode (from Jorah).
In the episode previous to this one, Mockingbird, Jorah is able to convince Dany against executing all of the slave masters of Yunkai, and instead, trying to set a less deadly example. It’s there that they have a discussion about the nuances of good and evil, and he reminds her that he was once a slaver, and had Ned Stark had him executed, he wouldn’t be there to help her free the slaves. She takes it to heart, and reverses her position. Well struck, Jorah!
So, when Jorah is revealed to have initially been sent to spy on Dany, you would think she would take a deep breath and think about the bigger picture before kicking Jorah to the curb so easily. NOPE! Turns out Dany very quickly forgot the valuable lesson she learned in the last episode, and the nuances of good and evil are once again lost on the girl. Jorah Spy=Jorah Bad. As opposed to Jorah(Loyal+In Love With You+Would Die For You)/Spy Turned Good=Maybe Deserving of a Second Chance. Unfortunately, Dany only seems to change course from black-and-white decision-making when she is advised against it by people in her circle. Unfortunately, she’s about to evict perhaps the wisest person in said circle, next to Ser Barriston, who’s the one who revealed Jorah in the first place.
I suppose it’s easy to see why Dany made this decision; after all, it’s almost impossible to know who to trust when you’re very clearly making a claim for the Iron Throne. But Season 4 started to show how Dany’s style of uber-principled ruling started to backfire, and this particular example showed how that style of thinking removed a valuable asset from her small council.