He cuts off his head to keep as a trophy.
In the EPIC of Beowulf, she was slain by a sword made for a giant and sliced her head clean off in one clean cut.
Beowulf cuts off Grendel's head to end the creature's reign of terror on Heorot and the people of Hrothgar's kingdom. It symbolizes Beowulf's victory over evil and his heroic triumph in vanquishing this monstrous threat.
Yes, Beowulf does fight Grendels mother, they fight in her lair. He chops off her head.
Grendels arm If its after the fight with Grendel's Mother then he took Grendel's head, the sword-hilt of the sword he used to slay Grendel's mother and cut off Grendel's head, and of course Hrunting the sword he originally brought to slay Grendel's Mother which was ineffective against her tough hide.
Considering that Beowulf was able to defeat Grendel without any weapons or armor, Beowulf is much stronger. He ripped Grendel's arm off in the fight and Grendel fled.Also, Beowulf was very young at the time.
grendel gets away, but he is fatally wounded and goes to his den to die.
Beowulf cut grendel's arm off and saved it as a trophey
After Beowulf cut off Grendel's arm, Grendel fled back to his lair where he eventually succumbed to his injuries and died.
Beowulf gets hold of Grendel arms. Grendel cant handle the pain and wants to return back to its den. But Beowulfs immence hands rip of Grendels and Beowulf slauters Beowulf.
He is attacked by Beowulf and Beowulf tears his arm off and injures him very badly. Grendel then escapes, but is so badly wounded that he dies, and Beowulf is seen as a hero. Later, Grendels mother goes to avenge Grendel's death.
Beowulf is extremely confident of his victory over Grendel. That was a victory he was proud of, he kept Grendels arm as a trophy basically. He wanted to show off that HE was the one to defeat the moster Grendel and that no one else did. So once Grendels mother took the arm away from him she took his "trophy" away from him. By Grendels mother taking the arm she was basically testing Beowulf. She was basically trying to show that she took his "trophy" back and if he wanted it back he had to go to her lair and get it himself.