Hypothetical: You’re on a par 3 and your opponent’s tee shot finishes 20 feet past the hole. He has a slick downhill putt for birdie. If he gets too aggressive the ball likely ends up rolling well off the green and down into the flats some 30 yards below the green.
Your opponent gently strokes his putt and it starts rolling to the hole while he starts running to the hole. The putt gathers pace and just as it misses on the left edge he taps it in–while it’s still rolling. Like a tip-in goal in hockey. He makes a double bogey 5.
He has avoided the dreaded high flopper from the flat the might roll back to his feet. He also doesn’t
have to worry about going past the hole and gingerly putting down the aggressive slope again.
I am pretty sure we’re going to start seeing this kind of activity unless the USGA makes a slight rule change.