Piper was so focused on finding out her answers, she failed to notice anyone in her path until the pair of them collided. "Hey, wh--" she cut herself off as soon as her eyes landed on the woman before her. "Oh, no," she shook her head, "You guys do not get to pull this little trick. Really, this isn't even remotely funny, taking on my sister's form?" she shook her head. "You demon-types are really reaching for things these days, aren't you?"
The one and only thing that even made her consider the idea of second-guessing her little speech was the way it seemed like demon-Prue was going in for a hug, but stopped herself. Prue would hug her, a demon? Unless they were a very convincing demon, which many of them could be. Master manipulation was kind of a requirement to be a demon. "If you're really Prue, tell me something only she would know." she crossed her arms over her chest and stared at the other woman expectantly.