 CONT: At the fancy dress party for the new crew, Margaret Ursula and  Hero are seen in the room upstairs talking. As Don is seen going  upstairs towards the room you can see Ursula dancing at the foot of  the stairs. When he reaches the room he hears them talking and the  door opens. He runs away. Ursula comes out of the room with Margaret  and Hero, but only seconds ago Ursula was downstairs and she had not  come up whilst Don was there.