These are some ideas that I tried to use in my most recent paper – for my Monsters in Medieval Literature class, but was unable to really get in when I was writing the paper at 1am the day it was due (because of poor time management on my part, over the weekend before it was due. A mistake that shall not be made again!)
Beowulf and Grendel are both others who have come from strange distant lands to fight each other on a turf that belongs to neither. This gives Hruthgar (roth-gar) and all those in Heorot (herr-or-ot) a kind of othered feeling. The focus is so heavy on Beowulf and Grendel that the camera of the text spends almost no time focusing on Heorot or its inhabitants. Every major group in the first two sections of the text are made out to be others. This includes Beowulf, Grendel and the inhabitants of Heorot.