at the risk of a mahooosive bite- yes, correct decision. wrong way of doing it, or atleast wrong way according to the lack of tv replays and using the technology available
I'm not sure how they came to it to be honest. But look at it this way, if the ref's got an obstructed view of the incident, and one of the linesman can see clearly that the ball never reaches the height of the defenders head, even if he doesn't know what it hit the fact the defender goes down holding his face is a dead giveaway that he handled it!