Having trouble with the bolded part:

> 沈む太陽が海に溶け、全てを赤く染めあげる一瞬の――儚いけれど鮮烈な一時は、しかしそこで止まっていた。水平線に半ばまで埋もれながら、決して落ちない太陽。
> **寄せては引き、引いては返すも** 、どこか現実味を欠いた潮騒……

What (I think) I understand so far:

> A fleeting but vivid moment when the sinking sun dissolves in the sea,
> tinting everything red. However, it stops there. This sun, half-buried under
> the horizon, will certainly not set. **???** Sea roar that is out of touch
> with reality...

How to translate the bolded part? Is it talking about the tide, so that

> 寄せて **は** 引き、引いて **は** 返す **も**

Are ほ、も the s.c. 係助詞 and simplifying it into 寄せて引き、引いて返す、どこか現実味を欠いた潮騒 it's
basically a long clause ((寄せて引き、引いて返す)、(どこか現実味を欠いた)) of 潮騒?

> sea roar that pulls back, then comes in, then pulls back again [...])?
> _(again, my English vocabulary is poor so that's probably not the right word
> for describing tidal movement.._.)

I have only recently read about the s.c. 係助詞 (I don't know if that's the
correct notion to use here, even) and a lot of vocabulary here is unfamiliar
to me so I'm looking for help as to whether I understood it correctly.

(btw please correct me if I failed at other parts of translation)
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2015-06-04T20:17:30.367
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2015-06-04T21:22:16.597
2015-06-04T21:22:16.597
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question
grammar comprehension
Unable to understand grammar/meaning here