When Cynthia (and Maxine) pied Siobhan in the previous episode, they hadn't factored that she was in a Union who would protect her, and expose their utterly inappropriate sanctions. Siobhan gives Cynthia a way out, however. If Siobhan is allowed to get sweet revenge on Cynthia, she will let the matter drop. So Siobhan enlists turncoat Maxine and together they deliver the 50 pie barrage to Cynthia, and then just to ensure she learns her lesson, they then strip her naked too and smear pie all over her naked body. Justice, and pie, has been thoroughly served.