Game of Thrones: Who Perished as the Bells Tolled Over King's Landing?

Qyburn becomes collateral damage when he attempts to intervene in the long-gestating fight between the Mountain and the Hound. He insists the zombified knight remain by his queen's side as the walls of the Red Keep crumble around them, but the Mountain has a score to settle and simple tosses the old scientist aside like a ragdoll.