Final answer:
The effect created by the author's use of pacing in the scene is suspenseful.
Step-by-step explanation:
The effect created by the author's use of pacing in the described scene is suspenseful. Instead of creating a terrifying atmosphere, the pacing builds tension and anticipation, keeping the reader on the edge of their seat. In the example given, the slow and mournful music, combined with the heroine's realization of danger, creates a sense of suspense.