Buffy watched her go but her slayer hearing picked up Cat's murmur, causing her brows to rise. Was that- Was that her voice? The hell? Maybe she was just imagining her own voice there, but she at least knew what Cat had said. Her eyes momentarily narrowed when Cat slipped into the crowd before quickly slipping back into her bouncy persona. Whatever Cat was up to would have to wait though since she had a time table to try and keep, but Buffy would remember her and the vibe she got. If that was her voice, then Cat was what, a mimic? really talented impersonator? Shape shifter? None of which bode well for Buffy in the long run.
Sighing inwardly, Buffy turned around without going after Cat to demand answers. She would just have to follow up on it when she needed to. She had no proof of anything and she didn't want to start a scene by going full on Slayer in a crowd of people on the off chance she was wrong. With another sigh, Buffy got moving again. She had shopping to focus on before this whole thing made her second guess everything.