Bi Fang, of course, couldn't really go eat flies.
With his current capabilities, apart from a deliberate demonstration, there was no need for such a "tragic" survival tactic.
After seeing Umai Lake and checking in, he had essentially concluded a part of his journey. He found some food in the nearby vegetation, made some tools, and then continued on his way. He smoothly entered the territory of Chad from Libya and saw several volcanoes.
Wa'an-Namus was an extinct volcano, overlooking the Sahara Desert from high above. This dead volcano appeared like a black scar on the face of the Sahara.
Beneath the volcano were towering rocks, and entering them was almost like entering a maze. Occasionally, you could see a venomous snake curled on top of the stones, blending with the brown rocks, hissing and flicking its tongue at the humans who ventured in.
Moreover, one visibly noticeable thing was the increasing number of birds above.