Game of Thrones: The Mountain vs. The Viper Season 4, Episode 8: Oberyn “the Viper” Martell finally gets the crack at revenge he’s been thirsting after for two decades, representing Tyrion Lannister in trial-by-combat against Cersei’s champion, Gregor “the Mountain” Clegane. On paper, the hulking Mountain should be the de-facto victor. But Oberyn’s size makes him far more agile, and his use of a poisoned spear as a weapon evens out the playing field. Rather, it should even out the playing field. Maybe the best takeaway from this fight is that stopping to monologue before delivering the deathblow is a very (very) bad call.