The lines are always set a bit port favored at the Nationals.
It was the last day and the Facio(PUR) and Armando(MEX) are still in a battle for North American Champion. Worrall way out of reach in the regatta.
Those guys are going to control the pin end of the line and were probably a bit conservative.
Then a perfectly timed wind shift,lots of luck and a brass set.
Gordo has done a lot for youth sailing in recent years.
Maybe a Karma thing.