To get the armbar, Ronda needs the clinch. To get the clinch, Ronda eats punches. And if you eat Nunes' punches, you're going to lose. And Nunes didn't even to be as cautious with Ronda like she was with McMann and Miesha. It's the icing on the cake to see her easily shrug off Ronda's clinch attempts, just like she did McMann and Miesha.