The shooting of the video lasted longer than planned - DUH - and he had to leave before they shot that scene.
Seriously, are people interested in unimportant stuff like this?
It's always the director's desition, or maybe they forgot to include him, or maybe he had to leave, or maybe he sprained his ankle, or maybe he didn't want to be there, or maybe he was abducted by aliens and they started using a double who looked exactly like Ron, or maybe he got drunk and wan't able to appear on that part of the video, or maybe he got high, or maybe he ran with the other people because he thought the explosion was real, or maybe I'm extremely bored...
This videos is a sign of Ron's Destiny !!!!
whenever i learn something new it pushes some old knowledge out of my brain, remember that home wine making course when i forgot how to drive?!