[THUNDERCHILD]

It used to be that the "D" player had to be set for 1 to 2 seconds and not moving for it to be a charge. I think a rule that prevents a player from just flat running overtop of the other team, but now it's used as a tool to try and draw a foul. And the same goes for the other infractions. It all comes down to the ref and how he/she's interpretation of the rule.
That's where everyone runs into trouble. And the players have to re-learn the rules (or how the refs interpretate them) every game.