Final answer:
Rainsford is feeling anxious, as indicated by the use of 'apprehensive' and the imagery of a wounded snake and a slow, careful approach through the bush.
Step-by-step explanation:
Based on the excerpt provided, Rainsford is likely feeling anxious. The text provides several clues to support this interpretation. The phrase "An apprehensive night crawled slowly by" suggests a state of anxiety or fear, as "apprehensive" indicates a feeling of anxiety about something that may happen. Additionally, the description of the night moving "like a wounded snake" conveys a sense of danger and unease, reinforcing the previous notion. Lastly, the careful and slow approach of something through the bush that grabs Rainsford's focused attention further amplifies the tension and Rainsford's likely anxious state of mind.