New interview with US Potter editor

"I'm not her [Rowling] collaborator. I'm just the stand-in for the reader," he explains. She doesn't need him to shape her story. His job -- along with Rowling's British editor, Bloomsbury's Emma Matthewson -- is to say, "This is how I reacted." Sometimes, he would say, "I do not know what's going on here," and Rowling would say, "I didn't want you to have that reaction at this point, so I think I'm going to move some information." At other times, when he asked about something in one of the earlier volumes, she would say, "That's a good question. I'm okay with your wondering that here. I will answer that in Book 5."