GMAT Sentence Correction (SC) | Re: The hognose snake puts on an impressive bluff, hissing and

The hognose snake puts on an impressive bluff,

hissing and rearing back,
broadens the flesh behind its head the way a cobra does,
feigning repeated strikes,

but,having no dangerous fangs and no venom, eventually,if its pursuer is not cowed by the performance, will fall over and play dead.

contrast wordbut divides the sentence into 2 parts.

snake puts bluff bu doing three things

hissing and rearing back,
broadening the flesh behind its head the way a cobra does,and
feigning repeated strikes,

...

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