They're all philosophies Callum Brightwell has employed at one time or another, too. "And in plenty of war propaganda," is what Jess says out loud, his eyebrows flicking upward in a noncommittal look. It's not hard to see that his memories of explosives don't exactly fill him with comfort, less so now that he's heard about her brand of bombs.

He thinks they have enough problems without following Nietzsche's advice, but there's still some truth to the idea that they need to up their game if they hope to ever escape. Explosives are better in their hands than the enemy's.

"Let me know when you bust open the canyon wall and then we'll talk. I wouldn't mind blasting our way out of here."