The pain of isolationism is a recurring theme in Grendel. Grendel is unable to communicate with his mother as well as the villagers and others who are afraid of him. He must feel lonely like he is going through his whole life by himself.
Wait, wait, wait, this is the scene where he eats the salibury steak and cries because it taste bad. They couldve put the scene where he cries blood at Anteiku because Hide dies or when he's screaming blindfolded when Jason/Yamori tortures him.