Answer:
It means that something in the blue sky above appears threatening. Whatever the thing in the sky may be is causing you fear! It suggests a horrible danger to come. You better run before it's too late.
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The first sentence is correct.
Bruiser is a teenage boy who is a unsociable person but later becomes a hero. Sixteen-year-old Tennyson fumes when he learns his twin sister, Bronte, is dating Bruiser, the guy voted Most Likely to Go to Jail, but Bronte insists Bruiser is misunderstood.
BTW Great Book.
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