I just saw the collision today (multiple times) on the HBO Special The Story Behind the Picture. It's the 1st time since '84 that I've seen a rerun of the multiple angle film shots and still photos of the collision sequence. Zola Budd clearly overtook and cut in on Mary Decker while 'slowing' in front of Decker. Budd was clearly at fault. Period. Analyze the program footage and see for yourself.