Myrwin just gave William a hard look. It was too early to break with the Iron Throne. The puppy would call the roses and the apples and the stags to go to war and Dorne couldn't quite yet expect to repel that class of invasion.
"We are equals, you and I." Myrwin reminded William. "Unbowed. Unbent. Unbroken." he repeated the words of his own House. "Dorne bends knee to the rightful king of Westeros." he said with a smile and the barest nod of his head.