The monster’s whole
body was in pain, a tremendous wound
appeared on his shoulder. Sinews split and the bone-lappings burst. Beowulf was granted
the glory of winning; Grendel was driven
under the fen-banks, fatally hurt, to his desolate lair.

Beowulf, Seamus Heaney (trans.)

Lines 814-820: While the mead-hall holds up under the onslaught of the fight between Beowulf and Grendel, Grendel does not. The Scandinavian warrior’s strength overcomes him, ripping his arm from his shoulder.