The most irritating to me was the guy on YouTube who said I said you should not use any physics knowledge, just go with the order of the contacts you can actually see. He said that after I objected to:
[BeginGarbage] BCA/WPA referee guidelines (which are different from the rulebook available to players) specify that the referee must see the foul itself in these situations. Watching for after-the-fact "evidence", such as the direction the cue ball travels after contact, is not the correct way to referee. You must actually SEE the wrong ball be hit first, to call it a foul shot .And as we all know, it's very difficult to see, especially when the shot is played with speed. Benefit of the doubt goes to the shooter. [EndGarbage]