whsweeper - here's a try: Obstruction is when you block another player from the ball, when you can't play it. If you are shielding the player from the ball and you can play it - it should not be called obstruction. If you step in the path of another player to prevent them from playing the ball that would be called obstruction. Unfortunately, you have to have the ref agree with your position that you can play the ball. My personal opinion is that most refs don't call obstruction as much as they should - some do, as in your case. Now who was right? Since he's the ref - he was. Hope this helps.
