Answer :
Gendel is unable to attack King Hrothgar's throne because Hrothgar is protected by God. Since Grendel is a descendant of Cain, a reference to the Biblical Cain, he ultimately fears the repercussions of the sins committed by his ancestors.
Gendel is unable to attack King Hrothgar's throne because Hrothgar is protected by God. Since Grendel is a descendant of Cain, a reference to the Biblical Cain, he ultimately fears the repercussions of the sins committed by his ancestors.