You did shrink down to the size of ant and you are in the manor of Halliwell sisters. So for Billie Jenkins, a witch, you are just a bug, insect beneath her feet. She sees you only as ant, she never looks down, beneath her feet, while she walks. Because of immense size difference she can not hear your voice, and her voice for you is just booming female thunder, waves of immense sounds, also hardy and almost not understandable. It is September, 2005, so eight season of "Charmed". You met her suddenly.