Just to be sure we all talking about this movie right?
Because if we are:
Buliwyf=Beowulf
they fight the Wendol=Grendal
in their first encounter Ahmed cuts off the arm of a wendol raider
later they have to delve into the wendol cave system to kill the "Mother of the Wendol"=Gredal's Mother
Buliwyf is killed during the fight with the Wendol army that is even described as a "fire dragon"
Beowulf defeats the monster Grendal by cutting ogg the beasts arm then Grendal's mother is slain then Beowulf is dies from his wounds sustained while fighting the dragon fafnir.