Whats the ruling?

[penfold]

Played in a medal at the weekend, one of my PP was having a mare on a hole hit a few putts already but when he missed another short one stopped the ball with his putter as it was rolling past then put the ball in and acted like he hadn't done anything wrong and said to the guy marking his card that's a 9.

I couldn't not say anything and said I'm not sure on the ruling but you cant do that and your probably going to have the NR or DQ yourself, he then said it was one shot penalty and the guy marking his card agreed in which I disagreed with but as I wasn't marking his card let them sort it out.


Curious to find out what the ruling is? Also, if anyone has actually seen this happen in a medal?

 

[Slab]

Two shot penalty I think: Rule 1-2



Edit:
DQ only for serious breach


Here's a decision of a worse example that's still not deemed a serious breach:


Q.
A player’s ball lies through the green. After playing a pitch shot up a slope, the player sees his ball start to roll back towards him. He places his club in front of the ball and stops it. The ball would have rolled only a few yards more and remained through the green. What is the ruling?

A.
Since the player purposely stopped the ball, he is in breach of Rule 1-2. As the breach was not serious, the player incurs a penalty of loss of hole in match play or two strokes in stroke play. In stroke play, he must play the ball from the point where he stopped it with his club - see Note 2 to Rule 1-2.