The leader, Beowulf, calmly told the guard that they were Geats. His father was famous. He came to kill Grendel. He said all this politely, but there was something unfeeling and mocking in his tone. Grendel, listening to all this, pretended to be confident, but he was nervous.
I hope this is what you are looking for. I have never read this books so I don't know.