What does the alliteration “clasps the crag with crooked hands” in the opening line draw attention to?

In the poem it is talking about an eagle seeing the sea as weak from the top of where the eagle is

“the first decision that led to brutus’ downfall is when he decided that he would join the conspirators in their plot to kill caesar. the plot did not work. the conspirators had to flee for their very lives. the second decision that led to brutus’ downfall is when he refused to listen to cassius. “ i hope this information you.