Here are two lines of the lyrics in a specific song:

> [出]{で}[逢]{あ}い **しは** [運命]{さだめ}か

and

> [纏]{まと}い **しは** [緋]{ひ}[色]{いろ}の[棘]{とげ}の[鎧]{よろい}

I'm 99% sure that the し here is the 連体形 of き; it follows the 連用形 of
[出]{で}[逢]{あ}う and [纏]{まと}う.

However, what I don't understand is why the 連体形 is being used and what it
means for は to directly follow the 連体形 of a (auxiliary) verb. It would still
make sense if the し was removed from both lines - is the し only there for
emphasis on the fact that it happened in the past, or does it have some sort
of other nuance or meaning or grammatical construction that I don't know of?

Thanks in advance!
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2020-12-03T04:52:36.387
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2020-12-03T04:52:36.387
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question
particles particle-は auxiliary-き attributive 連体形
What does it mean when 連体形 is directly followed by は?