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Two months before the 2014 NBA slam-dunk contest, Toronto Raptors wing Terrence Ross received a message from a guy he'd never met. A barrel-chested 30-year-old man who stood barely 6 feet was offering to help the NBA's reigning dunk champion defend his crown. Chuck Millan is the founder of Team Flight Brothers, a group of world-class dunkers who have gained a following uploading gravity-defying slams to YouTube and delivering jaw-dropping performances across the country.