If you romance Taash (and you should) it WILL drive you insane to think of them when Rook is in the fade prison.
They literally got into a fight with Rook before that battle JUST cause they didn’t want to lose them. So they try to not think about it.
And yet, during the battle, they cannot take it. As much as they were trying to avoid it, the thought is driving them insane, all they can do is beg Rook not to die.
And then Rook disappears.
They’re just gone.
I don’t think Taash rested for a second after. But there is also nothing they could do. They have lost literally everything in the last months and now Rook is lost as well. They don’t know anything about the fade or magic or any of that. They weren’t supposed to have to deal with it at all! They were there for the dragon stuff!
And the desperation of feeling useless and unable to do anything to get Rook back, at the mercy of Emmrich and Neve or Bellara’s expertise. Nothing to do, no one to fight, no way to make this better.
But I don’t think they lost hope for a second, I don’t think they stopped pressing and insisting that they could find Rook, that they were not gone forever. Because they asked them not to die, they begged them, and they have to come back and keep their promise.