That ominous A Knight of the Seven Kingdoms episode 3 prophecy actually ties into the George RR Martin book lore in a major way

What does that A Knight of the Seven Kingdoms prophecy mean?

‘A Knight of the Seven Kingdoms’ Boss Knew That Episode 3 Twist Would Be Spoiled Early — He Still Tried to Keep It Secret

"A Knight of the Seven Kingdoms" showrunner Ira Parker knew the Episode 3 twist would be spoiled early and made peace with it.

‘A Knight of the Seven Kingdoms’ Season 1, Episode 3 Recap: Waking the Dragon

Dunk makes a powerful new enemy. Egg makes his true self known.