Call me a one eyed Englishman, but Moriarty only really begins to accelerate after the ball is gone. He deliberately commits to a man without the ball. Lawes is accelerating the whole way and is committed to tackling a man in possession of the ball. Both players had the intent to hurt, but only one of them carried it out in a legal manner.
Agree with Greenwood. Moriarty was making a serious physical impression around the park (not that I wan't to condone his cheap shot on Farrell). It's early days in his career but he looks to suit the modern game very well. It's a massive, massive loss for England that he chose to play for Wales.
I would say that jumping for the ball means the defender has to check before they make the hit, meaning you're less likely to get clattered (wo)man and ball as you catch it (unless you get clattered in the air that is)
In that instance, it was a case of subjective misinterpretation of the laws. This case is different. It's a complete lack of knowledge of the laws on behalf of the ref. The result should still stand but mistakes like this should not happen.