She didn't bother to reply right away. She was too angry. She was thinking, but she wasn't thinking clearly. Her mind was more muddled than it usually was, which was saying something all things considered. The prospect of beating the good back into Lucius was apparently something she was willing to embrace as a legitimate way to go about this whole redemption thing right then and there.
"Or I could just punch you until you realize you're being dumb," Buffy replied, adopting her own stance as she sent a flurry of punches in his direction, one a shot to the gut and two more aimed higher in the direction of his face.