Is the wird snapped a verb?

Yes. It is the past tense and past participle of the verb "snap".

How Does jim react when makes it back to the raft?

To find out how Jim reacts when he makes it back to the raft, you can refer to the source material that contains this information. If your question is related to a specific book, such as "Adventures of Huckleberry Finn" by Mark Twain, you can consult that book to learn about Jim's reaction. Read the relevant chapters or pages where Jim returns to the raft, paying attention to the author's descriptions and character dialogues to gain insights into Jim's reaction. By reading and understanding the context, you can get a clear understanding of how Jim reacts when he reaches the raft.