 Elsewhere , <unk> <unk> <unk> Oswald investigates a disturbance outside the tavern she works at and finds the Doctor walking by . He attempts to leave discreetly , but <unk> follows him to a coach . Not wishing to become involved in matters , the Doctor instructs <unk> to bring him a memory worm that will erase the last hour of <unk> 's memories with just a touch . Before they can do so , they are surrounded by <unk> created from snow with psychic properties who attack the group . The Doctor realises that <unk> 's thoughts are creating the <unk> and ends the threat by instructing her to think of them melting . <unk> <unk> the Doctor that if he <unk> her memory , she will forget how to deal with the <unk> . The Doctor <unk> allows her to go and <unk> a staircase to the sky to return to the <unk> . <unk> follows him and knocks on the door , but she hides and flees down the staircase when the Doctor answers . <unk> returns to her other job as governess for the children of Captain <unk> . She learns that <unk> 's daughter has been having horrible dreams about their previous governess returning from the dead . <unk> 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 <unk> . <unk> tells <unk> she gets only one word to impress the Doctor with if she wants his help . <unk> chooses the word " Pond " , which <unk> the Doctor and <unk> his interest . 
