The Mountain and the Viper - S4-E8
Trivia: Pedro Pascal used to let fans playfully gouge his eyes, in reference to Oberyn Martell's brutal death scene at the end of this episode, which led to him getting an eye infection.
The Mountain and the Viper - S4-E8
Trivia: Towards the end of this episode, Tyrion and Jaime have a discussion about their brain-damaged cousin Orson. This is supposedly a swipe at Ender's Game author Orson Scott Card, who is a harsh critic of the show.
Answer: Basically it's because he broke his vow. A member of the Kingsguard is sworn to protect the king at all costs. Jaime elaborates more on the deed to both Catelyn Stark and Brienne of Tarth, telling Catelyn that no matter what course of action he took, he would be breaking one vow or another (i.e. if he obeyed the king, he would conversely be disobeying his own father), and telling Brienne that the Mad King was planning on burning all of King's Landing, but he did not bother to tell Ned Stark that. Ned Stark felt that killing Aerys was dishonorable and excessive. Robert Baratheon still could have usurped the throne without Aerys being killed.
Phaneron ★