"Not sure in a broader way than 'We got sucked into Thedas through a rift?'" Cosima asks, intrigued more than skeptical as such. "That sounds like a story."

Though she's giving him an opening, it seems. If he doesn't want to share it, no harm done. (Well, except piquing her curiosity, but she'll reluctantly live with that. She's nosy, but she tries to stop short of actually rude.)