PREP语法第20题

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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.
正确答案将划线部分换成了broadening the flesh behind its head the way a cobra does and feigning repeated strikes, but it has no dangerous fangs and no venom, and

请教：

后边未划线句子中，will前不需要加主语吗？我的理解是，and后边跟一个完整的句子，will前应该加主语？

huisang

S+V1+O1, and V2+O2.是很常见的结构. and之后的主语是S, 可是被省了，例句：
Whereas the honeybee’s stinger is heavily barbed and cannot be retracted from the skin, the yellow jacket’s stinger is comparatively smooth, and can therefore be pulled out and used again.（prep2008#1-194)
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十分感谢！