Unless he has some sort of smart system, tracking the zig-zags and spray on-off's he was not working from 3:35 onwards.
I don't doubt his ability but I doubt it is necessary to fly under the wires for fun or should I say for the camera. There was another thread where gurus went about flying for the camera. This is the same example just on a different area of work.
I did a lot of low level work and I find it healthy to climb to a safe height when finishing the job. And if I do something stupid, I won't go sharing it so some youngsters will think its fine and acceptable.