How much of a threshold did Anna Ash have in her apartment? She lived alone, and yet her threshold did quite the number on Harry's power. Back in SK, Elaine entered Harry's apartment and easily lit the fire and then, later, put up a veil she knew would hide her from Morgan and another warden, while still inside. I don't recall her ever getting the invite from Harry, so she had to have left some power at the door, hadn't she?