"Dude, you're the world's greatest BASE jumper," Shane says, after high-fiving Miles in the landing zone.

"I thought you were, dude," responds a rejuvenated Miles.

"No, I'm the greatest BASE jumper in the world," says Shane. They laugh at their well-worn Abbott and Costello–type routine. By noon, Miles has tallied 37 jumps; by 2 p.m., 43.

"I'm getting my fourth wind now," Miles says, returning to the tent after jump 43, his voice slightly hoarse from the woo-hooing. "It's all that energy from those people up there, dude, and now when I'm running through, all these kids are running over to high-five me. It's unreal."

At 4:30 p.m., there begins a gradual exodus of Miles's friends from the tent to the top for the group jump that will mark number 50. The crowd now numbers more than 500. "There he is!" shouts one of them when Miles hikes into view, igniting a chorus of cheers and whistling. Miles bounces down the walkway to the middle of the bridge, Nikki and Dorothy beside him. He stops to give a quick interview and kiss Nikki, and then he and four of his friends tumble off the bridge simultaneously, followed by a cascade of cheers and two more jumpers a few seconds later. After they all land, Miles gathers everyone for a group cheer.

"Thank you, Twin Falls!"

As his friends slap him on the back, Miles is looking around for a packed parachute. With news of a storm blowing in and more jumping yet to do, there's no time to savor the moment or its dual milestones: His 50th jump of the day also marks his thousandth lifetime BASE jump.

"My baby girl's waiting up there for me, and Everest is only ten hikes away," he says. Then he's off again.