Rules question - ball deflected on green

I played with a guy yesterday who was studying/practicing to be a teaching pro (plans on taking the PAT), and presented himself as an expert on the rules. We got on the subject of the two-stroke penalty incurred if a player's putt is deflected by another ball on the green. He claimed that if the player whose ball was hit had had plenty of time/opportunity to mark it but did not, then the penalty goes to that player, and not the player who putted... even if the player who putted never asked the other guy to mark his ball.

In stroke play, if the Committee determines that competitors have agreed not to lift a ball that might assist any competitor, they are disqualified.

19-5. By Another Ball a. At Rest If a player's ball in motion after a stroke is deflected or stopped by a ball in play and at rest, the player must play his ball as it lies. In match play, there is no penalty. In stroke play, there is no penalty, unless both balls lay on the putting green prior to the stroke, in which case the player incurs a penalty of two strokes.

Is that case, golf could become a sort of.....curling! Isn't that what it's called? The thing where they slide the big rocks down the ice?

if the guy doesn't mark his ball then yes it is a 2 stroke penalty.If he had time to

I sure hope I never take lessons from the guy trying to become a golf instructor.

LOL. I know - I hate to talk bad about the guy because he was certainly nice enough, but he was a little fuzzy on some other things too. For instance, a lot of his tee shots were really wild, so he'd often tee up another. On one of those occasions, he got down in 3 on a par 4, but with his second tee shot. His girlfriend says "nice birdie" and he says "yep, thanks".

Is that case, golf could become a sort of.....curling! Isn't that what it's called? The thing where they slide the big rocks down the ice?

Isn't that how it used to be done in Match play? Basically the person furthest from the hole putts (as usual) and if he/she is short or whatever, they mark their ball but also leave it there so that the person who had the shorter putt and is about to putt can use your ball to bank it in or whatever (but still return the ball to its mark if used with a bank shot), etc...I know I remember that from somewhere.

Never heard of marking it and leaving it. Until about 1952 though you did not mark your ball on the green unless it was within a certain (very close, like 6") distance from the hole. It's now remembered as the stymie rule. If another ball was in your way, you either chipped over it, or you had to play away from the hole slightly.

LOL. I know - I hate to talk bad about the guy because he was certainly nice enough, but he was a little fuzzy on some other things too. For instance, a lot of his tee shots were really wild, so he'd often tee up another. On one of those occasions, he got down in 3 on a par 4, but with his second tee shot. His girlfriend says "nice birdie" and he says "yep, thanks".

And it applied to all forms of golf, not just match play.