Breaking Scrabble's Golden Endgame Rule

Watching champions Josh Sokol and Jackson Smylie is always a treat for any Scrabble fan, but they recently played a game that showcased a completely new endgame concept to me. I was commentating the game and I had NO CLUE what was happening in the moment!
NOTE: Lexicon used was NWL18, on agreement by both players
‪@axcertypo‬ 's take on this game and the match: • One of the Strangest E...
‪@letsplayscrabbledotcom‬ 's livestream of the match: www.youtube.co...
Sometime soon, I plan to resume streaming on my Twitch channel:
/ wanderer15
I also have a weekly show on the official Scrabble Twitch channel (Tuesdays 3-5 PM ET):
/ scrabble