By David Craven Nu Brown’s incredulous red card united Rugby League tonight – leaving EVERYONE mystified. The Hull hooker was sent off after an accidental clash of heads when tackling Warrington’s Ben Currie in the 36th minute. Under strict new rules on head contact, you would expect a penalty. But the Kiwi was dismissed causing outrage across the sport from fans and players alike. The Super League season is only two weeks old but it’s already been dominated by headlines over a card frenzy amid the RFL crackdown. And even Warrington fans – who celebrated a first win under new boss Sam Burgess …