I’m currently farming Escape from Durnholde for Keepers of Time rep (on my 120 Horde) and no matter what I try, there is no option to free Thrall from his cell. I have the incendiary bombs and have been flown in by the dragon. I have the quest Escape from Durnholde: 0/1 Thrall’s Destiny Fulfilled. But when I talk to him, there is no dialogue option. He just tells me to leave him alone. Looking online, this looks like a bug that has been around since 2010 at least.
have you used them?
the bombs should be used, and the first boss killed before trying to free Thrall