Daphne smirked at him. Regardless of whatever litmus test that was going to happen, it was going to be good. Even not at 100% she was still good and now she had a bit of a point to prove beyond the standard ones she disproved every day. When it became clear he was waiting for her to make the first move, she pulled out her wand. However, she didn't move immediately. Instead Daphne took a moment to assess the situation, recalling what she knew of his style in fighting and also what resources she had around.
The absolute best thing about this as compared to her dueling competitions was that anything goes. Finally she moved, coming toward him in a sort of running lunge to sweep his legs and knock him off his feet. And if that wasn't enough to get him she cast a spell - not at him, but rather at her water bottle. This way if he dodged her physical movement he might be met with a splash of water in the face.