Pretty sure the antecedent is B. twins.
It's the main body,generally located in the middle of the book
Grendel is depicted as an evil mindless monster whose only goal is destruction and spreading evil. Considering that he's not depicted as an intellectual tactician but rather as a brute who wants to eat others, he would probably just heal up and attack again. Either that or he would ask for help from his mother.
Its a show
as thats the only big brother i know
of