To take back what is mine, Rhaenys thinks, but she doesn't give voice to the words. Instead she frowns at Jon, mulling over what he's said for a moment. A threat to all of Westeros... and, more importantly: Daenerys. Her aunt.

Their aunt. Not that either of them, any of them, know.

"And she has agreed to fight the Lannister woman?" Because that's all she's aware of, that the threat is Cersei.