Jeeese... I am glad a cud spark such a discussion! Since I am a European tard too, I cant really speak about Golf.... 
To be clear; I am sure that according to the rule book, Karl is definitely within his rights calling a foul. No doubt whatsoever here. But as someone stated, it is about sportsmanship and a certain code of conduct. All these guys have played thousands of racks in their life. They immediately know if the cue ball is in danger of scratching. This was absolutely not the case in the instance in question. I wud feel so ashamed winning a match by enforcing a rule that actually shud be delt with with a degree of common sense.
It is interesting how many people described Karl in a negative way. I never met him personally. A good friend of mine though was once in Spain at the Eurotour, when he was in the same pool bar in the evening and said that he was an arrogant ass! I had no reason to doubt...This - and for me it is definitely one - move sort of confirms my friend's story and the general impression I got from watching Karl in 2D.
If Shannon in fact did the same in an other match, ok, so be it. Then I wud (actually shud as of now) dislike him in the future too. But I can forgive, and u sometimes dont know, what had happened in the past between the two players. There is always a little history.
my next 2 cents...

To be clear; I am sure that according to the rule book, Karl is definitely within his rights calling a foul. No doubt whatsoever here. But as someone stated, it is about sportsmanship and a certain code of conduct. All these guys have played thousands of racks in their life. They immediately know if the cue ball is in danger of scratching. This was absolutely not the case in the instance in question. I wud feel so ashamed winning a match by enforcing a rule that actually shud be delt with with a degree of common sense.
It is interesting how many people described Karl in a negative way. I never met him personally. A good friend of mine though was once in Spain at the Eurotour, when he was in the same pool bar in the evening and said that he was an arrogant ass! I had no reason to doubt...This - and for me it is definitely one - move sort of confirms my friend's story and the general impression I got from watching Karl in 2D.
If Shannon in fact did the same in an other match, ok, so be it. Then I wud (actually shud as of now) dislike him in the future too. But I can forgive, and u sometimes dont know, what had happened in the past between the two players. There is always a little history.
my next 2 cents...