Buffy was rattled on the inside, but outwardly, she was calm, cool, and collected. She didn't know how or when she'd acquired the ability to hide her nerves completely, but she had, and she was thankful for it.
"Sweetie, you haven't even seen me fight. All I need is me and this splinter of wood." For effect, she twirled it in her fingers, watching the vampire as he circled closely.