Did George R.R. Martin cross a line when he wrote about Aegon II cutting Rhaenyra Targaryen's breast before killing her?

We know this because the entire Dance of the Dragons civil war is laid out in the book Fire & Blood; the fates of characters ...

First, Milly Alcock returned as young Rhaenyra Targaryen, then Nanna Blondell reprised her role as Laena Velaryon. But in Season 2, episode 6, we reach what feels like the final boss of these ...