A, their
the men brought their own tools
I think Grendel get stuck in a tree because of his careless curiosity of the world above him, that of the humans. He know nothing about that world because he was used to his own world in the underground however he still get tempted to explore. He was also attacked by a bull there because he looks different from the rest of the creatures above.
From the excerpt of "Dover Beach" by Matthew Arnold, the line "...on the French coast, the light/Gleams and is gone..." obviously symbolizes the impermanence of life. The light on the French coast is like an opportunity presented to us, once. We must be ready once this opportunity comes.
pot·pour·ri
/ˌpōpəˈrē/
noun
a mixture of dried petals and spices placed in a bowl or small sack to perfume clothing or a room.
a mixture of things, especially a musical or literary medley.
Therefore, the phrase "a beautiful potpourri..." or mixture "...of differences" means that whatever this line is referring to is a pleasant mixture of many different things.
Hope this helped.
