kids on spring break used to get killed jumping from hotel balcony to balcony drunk.
these look like highly trained gynmasts who know their grip, know their bodies. They got used to the wind and they just went for it, probably not really thinking thru the consequences. More of "I KNOW I'm not gonna fall..."
And after you've done those stunts for 10 or 15 years, you know you're not going to fall, even with the wind.
And these dudes are probably showing the youtube clips on their phones to chicks in church, bars, and grocery stores and getting poon for the next 50 years as a result of their crazy fearlessness. Women woudl love to brag they nailed the bravest man on the earth, the dude who pulled off such a stunt. way cooler than diring a motorcycle over 5 school buses.