A whole dragon screamed in pain being swarmed by a mob of zombies lol. He was still in the field putting in work when that swarm happened, all of those zombies went somewhere. It's not a "pop up cliche." The nigga ran to a whole sky lizard on the chance his bitch--the sky lizard queen--was over there. That's like calling a husband cliche for running to a woman screaming while frantically searching for his wife. Granted she don't love him, but if he was gonna make a save for anybody she'd be it because she's the only one he's listening/looking out for.
Furthermore, y'all do know Martin gave the show writers the ending right? He did so in case he died before ending the books. What you're seeing is what he intended to happen. One of y'all posted a video of this waaaaaaaay back on the IC if not here.
Lastly, Arya dipped before the Night King touched down if I'm remembering right. She ran out the room and, like the YouTube thing pointed out, no one knew where. She could've been out there hid while Theon and them scrapped it out biding her time since she knew NK was coming for Bran. Also, NK's singular focus could be seen as a weakness. When he focuses, his whole squad stops moving for the most part not out of respect but seemingly collective consciousness.
What good are a million eyes if they're all looking at the same target? It was subtle but that's what I got out of it.