what do the characters in the poem know about grendel? how is it different from what we know?

The other characters in the story are well aware that there are others of Grendel’s kind, that he isn't the only one. They understand that he lived with the others until he ended up alone...... they are also aware that it is a "monster" attacking the big house and that there is reason for vengeance. Not everyone remembers...... but there are those who do.