I'm playing this two handed solo. I'm at 49 threat and 48 threat.
I have the black serpent engaged with 6 damage and the quest has 6 progress.
This is going to be my last turn and I have two enemies engaged with player 1 and three other enemies engaged with player 2 who also has the black serpent with the serpents garb attached making him immune to player card effects. (The worst possible combo as I'm playing tactics spear of the citadel and gondorian spearman combos)
So in this quest phase during staging I draw two encounter cards. They are both Chaos in The Night and I have no cancellation.
Card reads- when revealed: the first player must choose: either raise each players threat by 3,or progress cannot be placed on quest cards until the end of the round.
I choose the second effect on the first card, and I believe I had to choose the first effect on the second card as each choice has to change the game state where possible. Did I do this correctly? That's how I understand the FAQ reads on this sort of situation.
Thus losing the game. That's twice now this card has lost me the game on threat 49 when victory was within my grasp in that turn. The previous time it was the shadow effect of this card. Which removed all progress from the current quest.