Patronuses looked to be two a knut, so Mattie swiftly tossed that idea out in favour of a jug as a prop and a variation of an Aqua Eructo charm, wherein small balls of water would leap up from the jug and erupt one after the other into droplets, in mimicry of a choreographed firework display. Gently enough not to get any of her opponents wet beside her, naturally.
