Final answer:
The quoted lines discuss the protagonist's pain, which is widely known and sung about, detailing Grendel's enjoyment of his war against the Danes and the ensuing misery.
Step-by-step explanation:
The lines from the text illustrate the widespread knowledge of the protagonist's suffering, which has become a tale spread far and wide, reaching everyone's ears. It tells of how Grendel's deep-seated animosity precipitated a brutal and relentless conflict against the Danes, characterized by his enjoyment of the carnage caused during these assaults. This narrative device helps to set the stage for the epic tale, indicating the broad impact of Grendel's malevolence and the protagonist's misery as a result of this warfare.