Elsewhere , barmaid Clara Oswin Oswald investigates a disturbance outside the tavern she works at and finds the Doctor walking by . He attempts to leave discreetly , but Clara follows him to a coach . Not wishing to become involved in matters , the Doctor instructs Strax to bring him a memory worm that will erase the last hour of Clara 's memories with just a touch . Before they can do so , they are surrounded by snowmen created from snow with psychic properties who attack the group . The Doctor realises that Clara 's thoughts are creating the snowmen and ends the threat by instructing her to think of them melting . Clara cautions the Doctor that if he wipes her memory , she will forget how to deal with the snowmen . The Doctor reluctantly allows her to go and ascends a staircase to the sky to return to the TARDIS . Clara follows him and knocks on the door , but she hides and flees down the staircase when the Doctor answers . Clara returns to her other job as governess for the children of Captain Latimer . She learns that Latimer 's daughter has been having horrible dreams about their previous governess returning from the dead . Clara realises that the pond that contains the old governess ' body is the only thing still frozen around them . She attempts to track down the Doctor but instead attracts the attention of Jenny , who takes her to see Vastra . Vastra tells Clara she gets only one word to impress the Doctor with if she wants his help . Clara chooses the word " Pond " , which shocks the Doctor and arouses his interest .