Hrothgar builds a meet hall and has parties every night ever since he built it causing disturbances to anything around it including Grendal the nearby monster.
Grendal Breaks down the door and kills 30 people with, and Hrothgar still has parties every night, so one day the king calls Beowulf over to kill Grendel so gradual rips his arm off for him to bleed out.
Death and Rebirth
Beowulf crosses the threshold by killing Grendel by ripping his arm off after the king has had enough of the killing that Grendel has created.
Returm to changed
The king Awards Beowulf with a sword for killing Grendel.
Grendel's Mother comes up from her under water cave and kills the kings right hand man.
King tells Beowulf and a few of his men to chase Grendel's mother down and kill her.