“It was the last day of Harry Potter. It was the very last shot of principle photography of Harry Potter. […] We knew it would be hard for Dan, Emma and Rupert particularly because they had grown up on Harry Potter and they had started when they were 11, 12. It was a very simple shot for them. It was a green screen shot, and they took it in turns diving. We did it two or three times, and then suddenly, that was it. That was the end of Harry Potter.”