When Christabel and Geraldine enter the castle, the lady Geraldine seems unable to walk across the threshhold, which has been blessed against evil spirits. Geraldine is seized by pain when she tries to enter and must be helped by Christabel: "The lady sank, belike tho' pain, and Christabel with might and main lifter her up, a weary weight, over the threshhold of the gate" (lines 124-127).
A second unnatural occurrence is described two stanzas later in the poem. The dog in her kennel, who is usually good-natured, inexplicably growls in her sleep as Geraldine enters. The poet wonders, "The mastiff old did not awake, yet she an angry moan did make! And what can ail the mastiff bitch? Never 'til now she utter'd yell, beneath the eye of Christabel" (lines 142-146).
These portents foreshadow an inherent evil in the lady Garaldine which the innocent Christabel does not recognize.