Writing a reaction essay presents several challenges. First, the writer must understand what a reaction essay entails - reacting to a topic while exemplifying it through a well-supported essay. Maintaining objectivity while including a personal perspective also proves difficult. Additionally, ensuring a logical essay structure with a clear introduction, body paragraphs, and conclusion is key to engaging the reader. Finally, conveying thoughts in an eloquent yet authentic manner without relying on clichés requires a strong command of language. In conclusion, crafting a reaction essay demands balancing analysis with personal expression, maintaining clarity of structure and thought, and using language effectively.