Adric:  We 're outside .
Romana: Pity . I want to be on the inside .
Adric: But I 've just rescued you .
Romana: Thank you , but I have GOT to find out what they 're up to in there . Do you know what a Tharil is ?
Adric: No .
Romana: Well , there 's _ one _ loose on this ship , and they 're terrified of it . It 's like Biroc but horribly burned .