Earlier, when Buffy had popped into the room she shared with the boys to see both Derek and Alcide with their jumpsuits down to their waists, she was pretty sure she was in some sort of reality show, one she had no interest in being kicked off.

Buffy had snuck a cup of coffee after dinner too because she'd assumed she and Derek would end up exploring tonight. She's keyed up and ready to go when Derek hisses at her. He may have his jumpsuit around his waist, but hers is only unzipped a bit lower than usual. She takes her gas mask off and slips her feet into her shoes then grabs her flashlight. She'll follow Derek out the door silently, letting him lead for the most part. She's still restless and jumpy. She knows it's probably because of the coffee (but assumes it's the caffeine) but she'd needed it to get through the day.