Based on what you know out modernist poetry and the slogan "Make it new," why would modernist poets stray from formal poetry?
Straying from formal structure is a way to ensure that poetry will last into the next century.
O Avoiding formal poetry is a way to rebel against poets of the past.
Breaking form rules is a way to make poetry look and sound different from past poetry.
DONE

because he was killed by the black arrow.

"the tune the he might never know again." this part build anticipation. dexter got extremely happy by the piano tune. he could see what he was living at that moment in his life throught this feeling. the reader might want to learn more about his happy life. in fact, he called it a state of   'ecstasy'. the fact that he had got in a mood of intense appreciation and that everything about him was extremely bright and glamorous might lead the reader to feel that this state of happiness may not last long. the two parts from the excerpt that exemplify the anticipation are: " the sound of the "; " it was a know again."