We were so looking forward to this battle — Oberyn Martell bravely agrees to be Tyrion's champion in order to get his revenge on The Mountain for what he had done to his family. It even looks like Oberyn is the winner — but he screws up right when he's about to win. The Mountain gets the better of Oberyn and crushes his head in one of the goriest scenes on this show ever. Oh, and Tyrion is sentenced to death too. Lose-lose.