Grendel admits that he feels nervous about beowulf because

Grendel, listening to all this, pretended to be confident, but he was nervous. Yet he was also excited--suddenly, looking at Beowulf, he felt alive

I hope this helps

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.

sunflower is pretty good, roses is decent though the song isn't that good, those are the best two i could think of