Buffy wasn't sure if she believed that he would actually do it or not, but she knew that she had to find out. She believed in him, but that didn't mean she wasn't tired and scared. She didn't notice the knife, but then again observation before action had always been a struggle for her. She was far too exhausted physically and emotionally to pay attention to those details now.
"Maybe it is," she answered, anger in the way she spoke even though she wasn't yelling anymore. "Show me what you're capable of."