What were Samneric afraid of and what caused those fears? How did they deal with those fears?

Initially, Samneric are scared by the "Beast of the Air". They deal with it through loyalty to Ralph and don't desert him like Roger and Maurice. They are the last "biguns" to stay loyal to Ralph. However, after being captured and beaten by Jack's group, they are afraid for their lives and tell Jack that Ralph has run into the jungle.