For 10 points—name this character, the namesake of an Old English epic in which he kills Grendel.
He was depicted in one work slamming his enemy against a wall and forcing him to sing about the hardness of it, and earlier in that work the narrator had noted how this character's lips don't move along with his words.  In another work, this character avenges the death of Aeschere, and had earlier claimed that "in the waves I slew nicors by night".  That work begins with the funeral of Scyld Scefing, and contains a scene in which this character rips off the arm of a beast, before his sword Hrunting fails him in the battle against that creature's mother.  For 10 points—name this character, the namesake of an Old English epic in which he kills Grendel.
He was depicted in one work slamming his enemy against a wall and forcing him to sing about the hardness of it, and earlier in that work the narrator had noted how this character's lips don't move along with his words.  
Beowulf