Upon wandering off to the Scottish shoreline, Harry notices something strange happening to him. If he really focuses, he can hover a few inches off the ground for a few seconds at a time. He spends the rest of the video developing this skill, until finally he is no longer constrained by gravity and can fly freely into the heavens.
Harry Styles: Is he the last airbender, a regular wizard, or a literal angel sent to Earth to redeem us mortals for our sins? He does walk on water at one point in the video, so I'm leaning toward the last option.