[閒聊] 地平線2主題曲in the flood歌詞意境

這首歌頗喜歡，尤其全破後我還聽了好幾次，歌詞如下：

Am I the one to hold
This crown of ash and salt?
Their kindness calls to me
I have to block it out
My voice has grown so somber
These words don't seem like mine
But the iron won't subside
No matter, no matter what I try

Am I raindrops in the flood?
In this emptiness, in the storm
If I falter, if I fall
The wave inside my soul carries all I know
Who can take my hand in the flood?

A voice calls me forth
Through darkness unknown
My heart with silence burns
Through solemnness and bone
The edge beyond the shore
This wеight of wood and rot
I long to reach the other
To find, to find thе path we lost

Am I raindrops in the flood?
In this emptiness, in the storm
If I'm broken, if I'm torn
The wave inside my soul carries all I knew
Who can take my hand in the flood?

歌詞大概的意境都能體會，不解的是第一次副歌是all I know，第二次是all I knew，是有什麼特別的用意使用不同時態嗎？

閒聊一下，謝謝回答！

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