That's a great video, I used to own that video on tape but it was a little longer and it had a world championship match between Greenleaf and I think either Rudolph or Taberski, and all it shows is Greenleaf running the last 7 balls of a 125 and out. what struck me is how totally relaxed and confident Greenleaf looked, like he knew he could do no wrong, you don't see that with todays champions, everyone plays tense and tight now.
An old timer who saw Greenleaf in his prime told me that if you went to a tournament back then and you saw all the players playing and if you didn't know what Greenleaf looked like, you'd know who he was immediately just by his aura, he had a presence at the table like he owned it.