Mark
If Knost only adopted this behavior on the 17th, I would agree with you. However, from what I saw, he was a bundle of nerves both days. If there was a problem, Willett (or Dalgleish, what's a Captain for, anyway?) should have said something earlier. If he was in his field of vision on the 17th, just tell him to move away. I do it all the time.
And, if Edwards had hit the shot that Moore did, you would have heard it in Dublin. JMH(AB)O, of course...
Tom
I fully agree that a player should remain perfectly still and quiet while his competitor is preparing for a shot, and if appropriate or asked, place himself completely out of his line of vision.
If and when Knost goes pro, he will learn the proper etiquette very quickly. If not, he could go the way of Gordon Sherry, who's very promising career floundered and never recovered, from several breaches of etiquette in his early days on the Euro Tour.
Rich