Stu, let me add this modest piece to your immense knowledge of the pool world.
That's an extract from WPA Regulations, effective as of March 2016. I mean, it is not a novelty, so has nothing to do with recent (2025) updates to official Rules and Regs of the game.
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It has been like than for more than two decades at least.
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@ctran 
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Also, the rules of pool require any referee (even Marcel) to be 100 percent sure about the foul for them to make such a call. Meaning, if a ref is only 98 percent sure he is supposed to stay away from calling a foul. (The afore-mentioned benefit of a doubt)
Forgive me, I grew up in the days when split hits were fouls, and it is more than 20 years since I last competed. To be fair, it's a rule that comes up about once a year for a typical serious player. That was the rule for about thirty years. I do try to keep up with rules changes, but I guess I missed this one.
Yes, we all understand that Marcel's lack of understanding of the game, which others have already noted, explains why he was not sure of the call, but this call could hardly have been more obvious to anyone with a comprehension of how to make this kind of call.
Even an average APA referee gets this call right every time. So, yes, because he had no idea what he was doing nor how to evaluate the result on the replay, Marcel was not sure and ruled accordingly, but this is one of the worst calls I have ever seen by a referee.
The moral of the story is that referees who are incapable of making a call as simple as this one should not officiate in the later rounds of a major. Get someone who is up to the task. Of course, somebody just needs to train Marcel to make this kind of call, which he has gotten wrong before.
We can't have this kind of officiating error. Bob Jewett, the most knowledgeable man in the world on the subject of the rules of pool, deemed Capito's foul obvious, even without a replay. This kind of cluelessness compromises the competitive integrity of pool's biggest events and is not excusable on the basis that a referee is either poorly trained or unknowledgeable with respect to carrying out his duties.
Let's not look for a way to defend the indefensible. A GIANT error was made that may possibly have decided a quarterfinal of a major. It's best when the players decide who wins.