Answer:
They missed the safety and comfort of home.
Explanation:
Based on the excerpt, the reason the people who were captured stop flying is because they missed the safety and comfort of their home.
In other words, this simply means that, since the reason they forgot about flying, was when they could no longer breathe the sweet scent of Africa, sweet scents of Africa translates to missing the safety and comfort of their homes.
To breathe the sweet scent of Africa does not translates to: saving power to escape.
Nor, not wanting anyone to know about their special power.
Also, it does not translates to being able to fly over land, but not over water.
