While this wasn't directed towards me, I think the better question is why are you doing this? Even with the benefit of being able to watch multiple replays in super slow motion, half the people don't believe any foul occurred at all, that's how microscopic and unbelievably light the contact with the nine was even if it did happen. So microscopic that Yapp clearly wouldn't have been able to feel it when the tip was hitting the cue ball at the same time, under the nerves and preoccupation with it being one of the last couple of balls for the US Open title and a hundred thousand dollar prize.
Yet here you are seemingly on a sworn mission to get a guy widely considered to be one of the most upstanding guys in pool publicly labeled as a cheater for a perceived foul so miniscule half the people don't even think it happened at all even after watching it over and over in slow motion. Its almost as if you have something personal against Yapp and have had it out for him and been waiting for something to come along with which to try to nail him to a cross for. Fess up, what did he do to you? Is it just because he beat one of your idols?
Well you got one thing right in the thread, Marcel is the worst ref in pool, or real close to it anyway, so incompetent he shouldn't be allowed to be reffing your local APA match much less a professional event. Dude has blown more obvious calls due to a lack of very basic knowledge than anybody else out there that I am aware of. This wasn't one of them though. Again, pretty good chance no foul even occurred at all, but even if it did he could hardly be faulted for failing to see live the one millionth of an inch nine ball movement that half the people can't agree even happened after watching super slow motion videos over and over.