Clara was seething with hatred as she stared at Marcel dancing with that woman. Whether the redhead or not, she hated any woman close to Marcel. She was the one supposed to be dancing happily with Marcel, not that bitch. He was her fiancé, they should all back off.
So she looked for an opening to strike and when Marcel lowered her, Clara notified her friend with a nod and she twirled her at that moment, her bum intentionally hitting Marcel's date in the face. The bitch should have fallen to the ground with the amount of momentum she knocked her with, but she only stumbled and Marcel managed to pull her back up.