The Question and Answer section for Kidnapped is a great resource to ask questions, find answers, and discuss the novel.
From the text:
The second day I crossed the island to all sides. There was no one part of it better than another; it was all desolate and rocky; nothing living on it but game birds which I lacked the means to kill, and the gulls which haunted the...
I'm sorry, I see no evidence of the event you're questioning in Chapter Five.