Per the youtube video [MENTION=132916]Junaids[/MENTION] has shown here's the top comment.
"I was there at Kensington that day, and believe me, if you think he was medium-fast, you have no idea what you are talking about. That first over, I never saw the ball. The reaction of the crowd was magic, because it was the first time he'd bowled in the Oval. Silence, he'd bowl, Boycott would look totally lost, then the crowd would go nuts. You can't see it from the video, but he clean-bowled him with the last ball, and the stump went pinwheeling past the wicket-keeper."
So either the people who were there that day are miscalculating or he was fast.
I just don't know what to believe anymore.