Tonight, in New York City, an illuminated sphere will slowly descend down a pole and people will shout, kiss, laugh and cry. All of it will be cold and pretentious and absolutely perfect. And what better way to welcome 2015? Well, for Leif Engstrom and Balaram Stack, an air reverse feels much more appealing. Two of New York’s finest recently crossed swords in Puerto Rico and the fruit of their labor is in a digestible clip above.