After Grendel begins attacking Herot why is he allowed to continue attacking?

Answer:
After Grendel begins attacking Herot why is he allowed to continue attacking?
Explanation:
The most obvious motive for Grendel's attack is envy and a sense of exclusion. He hears the laughter in the mead-hall, hates the Danes and their merry-making from which he is excluded, and resolves to kill them. Even slaughtering thirty does not satisfy him and he returns night after night to drown his misery in blood.