This was all the more spectacular, as he'd come into this season after an incredible run the previous year, when he won the Eddie, The Triple Crown, and the World Title. No one would have blamed him for easing up.
Instead, he found an entirely new level of brilliance, with a commanding run through the event relying on huge carves - exited, somehow, with more rather than less speed - the likes of which had never been seen before in competition.
This event is being celebrated in this week's edition of WSL Rewind, where you can relive one of the most naturally-gifted and compelling surfers in history absolutely toying with one of the most challenging waves on the Championship Tour.
So, how did Florence become such a master in big, shifty open-ocean waves? His childhood on the North Shore of Oahu certainly helped, with ready access to plenty of big, powerful reef breaks.
In fact, you'd be forgiven for thinking Main Break, on its day, bore something of a resemblance to Pupukea, a wave which has played a staring role in Florence's development as a surfer.
This was also shortly after Florence began working full-time with coach Ross Williams. He recently told the WSL that Williams helped him connect some dots, and work on his "in between" surfing.
"I spent my whole life taking off on a wave and going as fast as I could to get from point A to point B on the end, rather than figuring out what's in the middle there. I would just pump and try and do something big," Florence said, during an interview for The Lineup podcast.
However he did it, this was the event at which an athlete who was already at the cutting edge - widely considered one of the most exciting, progressive and entertaining surfers of a generation -- somehow found an entire new level, and put on one of the best shows in the history of competitive surfing.