Buffy stepped into the center of the circle, but she crossed her arms over her chest and raised an eyebrow at him as he mentioned kneeling. "Really? Kneel in the center of the circle, huh? Where did you get this? Blood Sacrifice for Dummies 101?" Eventually, she did kneel, if only to humor the situation with a roll of her eyes. Humor was most definitely her coping mechanism.
"Dear God, please let mommy get me that pony I want and let me not mess up at my tap-dancing recital this week and help me to give the bestest blood sacrifice in the whole, wide world to whatever demonic entity will take it today. Amen," she couldn't help but snark as she knelt there waiting.