"Oh Felix, come on, you need to stretch your little wings and have a go at flying," Zhenya said to the dragon, rubbing his wings. He opened his eyes and looked at her for a few moments before standing up again. Sort of. She rubbed his wings again, until he opened them, then she released him. He had no choice now but to fly.

He didn't fly up, he flew down, until he was back on the ground.

Why did she get the stubborn one?

Right, make use of Incendio. Zhenya picked Felix up, and held her wand with her hand and rubbed his wing again, until he opened them and started to flap them. When she released him, he flew up, and before he had a chance to fly back towards the ground, Zhenya pointed her wand underneath him and said "Incendio," tracing the shape of a flame and aiming it towards him.