Feeling sympathy for Hrothgar 's miserable wife Wealhtheow Grendel decides to finally kill Hrothgar and take her to his lair .
Wealhtheow is also the object of Unferth 's secret affection .
Feeling sympathy for Hrothgar 's miserable wife Wealhtheow , who is also the object of Unferth 's secret affection , Grendel decides to finally kill Hrothgar and take her to his lair .