Her Aura will break and leave her vulnerable eventually, but even a Space Marine is going to need more than a few hits to do it. Now that the element of surprise is lost, Nora's not interested in stopping any more sword strikes with her rib cage, and she sidesteps the strike into a hammer swing of her own at his unarmed side. She's not sure Loken can withstand her full strength, so she's not putting everything she's got into it. They can discuss any lack of respect later.