Because Hrothgar is king and his throne is protected by God which makes Grendel back off because his evil ways are no match for the power of God
Grendel only ever attacks the hall, never any other building. Hrothgar and Wealhtheow retire to a bower (buhr) for the night. Beowulf similarly is not in the hall when Grendel's mother attacks.
why does Grendel aviod Hrothgar's throne?
Grendel first encountered Hrothgar and his warriors during a feast in Heorot, their mead hall. Grendel attacked the warriors, killing many of them, which led to his ongoing feud with Hrothgar and the Danes.
Grendel resents Hrothgar and his men because they are joyous and successful in their mead hall, while he is an outcast living in isolation and darkness. Grendel sees the humans as arrogant and unworthy of their happiness, leading him to attack them out of jealousy and frustration.
During Grendel's first attack, King Hrothgar and his queen are likely hosting a banquet in Heorot hall. They are enjoying the revelry and feasting with their warriors when Grendel unexpectedly invades, killing many of the guests.
hrothgar
Hrothgar's companion who was killed by Grendel's mother was called Aeschere.
Grendel doesn't touch Hrothgar's throne because it is protected by God. The throne represents Hrothgar's rule and power, and Grendel's inability to defile it signifies the presence of divine protection. This restraint shows the limits of Grendel's power and the influence of God in the story.
Hrothgar asks Beowulf to help him defeat the monster Grendel that has been terrorizing his kingdom. Beowulf responds to Hrothgar by vowing to protect his people and rid them of the monster. He laments about how Grendel has caused so much destruction and sorrow, and how he wishes to avenge the death of Hrothgar's people. There are several similarities between Hrothgar and Grendel and Grendel's mother. Both Hrothgar and Grendel are powerful warriors, and their actions are motivated by a desire for power and revenge. Both are also willing to take drastic measures to protect their people, such as Hrothgar building the great hall of Heorot, and Grendel and his mother attacking the hall. Both are also feared by the people of their kingdom, as they are seen as powerful and dangerous forces.
As a result of Grendel's attack, King Hrothgar's warriors became fearful and the once-boisterous mead hall fell silent and abandoned. Grendel's presence instilled a sense of dread and despair in the kingdom, impacting its people and their way of life.
The monster Grendel is causing havoc in Hrothgar's kingdom in Beowulf. Grendel terrorizes the kingdom by attacking the warriors in Heorot, the mead hall.
Grendel imputes a horrible dream about tree trunks to Hrothgar. In it, The floor of the forest, he is standing in disappears, growing trees are fighting with one another. The flash of a sword is shown. The dream is recurring.