<h3>It makes Bellerophon fall to earth, which indicates he overstepped his human boundaries.
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Explanation:
When Bellorophon decides to ride Pegasus to Mount Olympus so that he could reach the realm of Gods, Zeus becomes enraged by Bellorophon's, a human, impudence and arrogance.
In order to teach Bellorophon a lesson, Zeus sends a gadlfy to sting Pegasus and stop the rider, Bellorophon, from making such an attempt of reaching Olympus.
Thus when the gadfly stings Pegasus, it throws Bellorophon off from its rear. Bellorophon falls back on Earth and is reminded of his arrogance and impudence. This decision to dismount Bellorophon by Zeus indicates that Bellorophon has overstepped his human boundaries developing the theme that "excessive pride leads to one’s downfall".
