Considering the sonnet's substance, the impact of the style in this haiku is to make a "premonition tone."
A premonition tone is a tone wherein tells the crowd or the peruser or have the inclination that something malicious or unsafe is going to occur.
Consequently, since the sonnet's substance says, quiet mid-night our old scarecrow overturns down unusual empty reverberation, this is an illustration of a premonition tone that some hardship is going to happen.
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