We suppose that’s not particularly shocking, though Bjornsson does add later that “I think it’s pretty obvious [The Mountain is] going to die in a fight” — but a fight with who?
The Hound, once a despised villain, has undergone a humanizing transition since re-emerging after losing his fight with Brienne in Season 4.
But when Game of Thrones gets you to sympathize with a character, that’s often the mark of imminent, excruciating death.