The Greatest.

She thought to herself, "It seems Second is going to fail too."

That thought cheered her up. Then she met Third. She, too, was failing to get the hang of flying. The sight pleased First very much. 

It cheered her up enough to encourage herself, "I mustn't slack. I must get it right on this turn."

It was fourth brother's turn by the time she was brought back to the cave. 

Fourth said to her with arrogance. "Watch me."

She watched him. She wanted to see him fail. But she was disappointed. She saw him drop, but he didn't scramble to reorient himself like them. He stopped falling after a few seconds. Then he flew away down the mountain.

He roared in victory as he soared. "I am the greatest."

First couldn't believe her eyes. She asked in disbelief, "How did he get it on the first try?"