"That's what I started to think," Buffy replied to Faith in response to what she'd said about Xander. "We can keep an eye on him and make sure he doesn't get hurt, but he can help up out at the same time."
It didn't take long at all for Peter to show up, and Buffy was glad. The more help, the better, and she figured Peter probably wanted to make up for his little lawyer-related mistake, too. Or maybe he just wanted to see Willow safe and sound as much as she did, which was fine by her, too.
"You don't know if she's in there?" Buffy asked him, looking to the house as well. "Doesn't matter, though. A mental block is suspicious enough."