The Question and Answer section for Grendel is a great resource to ask questions, find answers, and discuss the novel.
During Grendel's attack, Hrothgar's men work quickly to douse the lights in order to gain an advantage over Grendel. This is ironic because unknown to the men, Grendel can see in the dark.
Grendel hates the obvious happiness in Hrothgar's hall. He is twice attacked by humans and made invincible by the dragon's magic. He is not accepted by the humans, thus, he makes it his work to kill them.
When Grendel first meets Hrothgar's men, he is overcome with curiosity, as are they. If fact, the men believe Grendel to be a tree spirit and attempt to feed him. It isn't until Grendel tries to verbally communicate with the men that they become...