In the first section of this story, the rising action is the attack of Grendel on Heorot.
This refers to events in a story that later lead to the main conflict or the climax of the story.
In this story, the rising action is the first time Gredel attacks the people. This is because this event is the one that leads to the main conflict between Bewoulf and the monster and therefore this event triggers the climax or conflict of this story.
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