Hrothgar gave Beowulf an advise :He said that Beowulf achieve many things and become powerful but he didn't forget that he has to die one day.He said that one day he stops to look around him and then a killer comes after him.
Hrothar and his men though Beowulf met his death because the water turned red with blood
Beowulf told his history : the battle was very difficult and he nearly died down there.Hrunting was a good sword but it melt. Fortunately he found another in the lake and he killed the monster.
Beowulf's men put the head on a spear.
The sword Beowulf had used to kill Grendel's mother began to melt.
Beowulf swam up to the surface with the monster's head and the sword hilt.