And, I will go through the actual line by line derivation not because I want to do derivations in class.

我们要仔细讨论实际的线,和推导出来的线,并不是我想在这节课做推导。

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Maybe it could refer to either the poet or the sun throughout the entire line, if you think of the mantle blue as being the actual sky that the sun is able to twitch over his shoulder.

或者两者皆可,从整句的行文看来，如果你们把蓝色的丝巾看作是真实的天空的话,那么太阳的确是能够在他的肩上轻轻颤动。

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