Beowulf is battling against evil because he sailed to the Danes to rescue them from Grendel. It is evident in lines 195 onwards to fight Grendel. SO when the night came, Beowulf and his warriors waited in the hall for Grendel to come. Together with his warriors, they sailed to help King Hrothgar defeat Grendel who continued to kill his men.
What is the question you are asking sir.
It fades away. Nothing happens.
Hope this helps!
I would say to make Predictions while reading because Skim it you wont read all the information and wont know everything read it quickly if it is difficult to read you cant read it fast read it at the last minute no matter if it is easy or not that isant a good idea to read it at the last minute .