What is the meaning of く here?

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    く‥、邪悪な気が強くなっている‥
    
    く‥‥好むと、好まざるとまわりをまきこみおし流してゆく‥
    
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Are these く the same as くっ?

(1) SFX for "damn it" like a silent curse;

(2) Mumble under the breath when in a difficult situation;

(3) When one tries to hold in their voice or is trying to hold back pain or
pleasure.

