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... even if his view was impeded on the ground, the sky was unobstructed.
Moreover, the fire hawk flew exceedingly high, so the occasional trolls riding wind snakes across the sky failed to spot it.
Although wind snakes could fly, they were not particularly good at transportation. Riding a wind snake was inconvenient, and trolls only occasionally flew on them. But it did barely constitute an aerial defense system.
Of course, underestimating the combat strength of a wind snake ...
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