The fear experience by the boys is justified because they are fearing the unknown rather than the beast.
On the other hand, their fear is not justified because they were not sure about the existence of the beast.
Fear serves as a natural and primitive human emotion which involves biochemical response as well as a high individual emotional response.
In the excerpt, The beast is an imagination to some of the boys but mere hearing about a beast caused them to fear more.
Learn more about fear at;
https://brainly.com/question/25950911