She trips

You don't want to wait to give her the choice.

As the two of them take another step along with the rest of the queue, you click your fingers and watch the heel of one of her boots snap. She looks for a second as if she might be able to regain her balance, but you ensure that isn't the case.

Within seconds she's flat on her face on the floor, her skirt flaring up around her waist while the broken shorts fall to her ankles, almost tangling her feet together as she lays there her round naked arse on full display to the long line behind her, several laughs and gasps coming from all the people around her staring at her sudden nudity.