He was a hero for kicking the stupid linesman who wasn't doing his job. The guy should have been focused on his line, and as a result of not
being focused on his line, he didn't see Nalbandian quick enough to move out the way. So; linesman's fault for getting the injury, ought to have been a point penalty and a fine for Nalbandian for kicking the board, match should have been completed.
The line umpire was guilty of watching the match. It's always his/her responsibility to get out of the way of an oncoming player, no matter the reason. The player has enough to worry about playing the match. Mr. Nalbandian had just made the shot, missed, and got upset. Nalbandian's Chuck Norris like kick was continuous to his play - stroke, follow-through, step, hop, kick. There was no premeditation. It was done in blind passion, which is why he obviously didn't notice the line official sitting just above the box frame.
Compare this to Novak Djokovic at Rome SF 2012 and
Roland Garros Final 2012, where Novak had lost the game, slowly walked back, then lashed out in fury, in Rome at the netpost with Nadal and ball kids standing right in front of him and the head umpire right above, and in Roland Garros at the Perrier sign with the crowd behind.
It would have been terrible if shrapnel from the racquet had hit Nadal or one of the ball kids in Rome. Or if Perrier sign fragments had hit one of the camera people or people in the audience at Roland Garros. Novak's actions were more or less equivalent to David's (though David's more immediate to the play). However, the results were different. That's an unfortunate accident, and just bad luck for Nalbandian. The line official is clearly milking this.
Novak Djokovic should be the first one to understand Nalbandian's actions and speak up.
He was probably fined for Rome, and yet did it again on the big stage at Roland Garros, so clearly fines are no deterrent when match fury is present. It can't be controlled whether one is the #1 player or #100. Everybody on or around the court needs to have responsibility to watch out for themselves. This is a sporting event, played by strong men wielding racquets, not tiddlywinks.
The lesson is clear. Stay out of Novak's, David's, and any other player's way.