In the book "Greenwitch" by Susan Cooper, the character Jane is depicted as someone who feels a deep connection to her surroundings through her comforting drink. The imagery of her clutching her mug emphasizes her need for stability and a sense of reality amidst the unfolding events.
However, her sudden jolt and the spill of cocoa signify an interruption in her calmness, suggesting that something has startled her or disrupted her focus. This moment serves as a transition, highlighting the tension in the narrative and Jane's emotional state as she navigates her experiences.