they all accomplish the same thing, last nights decisions were correct because there was intention to slow down the play of the ball. I think Greg in his commentary on this mornings match said it should have been play on but the dummy half was intentionally throwing the ball to the first receiver and he was in the way so it was a penalty, accident or not. There are also accidental offsides which are harshly penalised. Weird decisions are also made when the ball hits the ref. But none of these were as bad as the examples from earlier in the season - such as the throwing of the ball at a player lying on the ground, wish I also remember being a forward pass.