Owen Gleiberman Chief Film Critic “Skywalkers: A Love Story” lends new meaning to the words “high anxiety.” It’s a documentary set in the world of rooftoopers, the new generation of daredevils who scale the tallest buildings they can find, climbing to the tips of skyscrapers and posting top-of-the-world footage of themselves on social media. Directed by Jeff Zimbalist (a former rooftopper himself), the film is brilliantly edited, and it’s full of amazing, terrifying, transfixing verité shots of figures walking on girders, sprawling on ledges, and scaling the spindly, often curved spires that shoot out of the tops of buildings, consisting up close of ladders in the form of precarious slats.