Buffy was very sexy, but yes the skirt was not doing her any favors. After the initial shock wore off from Ambrose he was able to react. He just watched her, he could have reacted, but that was not what she needed. She needed to be confident again.
"I would not say a dud. It did it's job at the beginning." He said, starting to circle her. "If you want we can pause for you to go change. Then we can begin again."