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Heyman revealed the decision to Mugglenet but would not confirm details of the scene chosen to end Harry Potter And The Deathly Hallows: Part One.
"The script [for part one] was written with an end in mind. The first draft was written with one ending and as we developed it, it went to another ending. And then we reverted in part to the original ending because we felt it allowed us a more emotional conclusion and felt like it was more complete, as it were," he said.
"But we've added this other scene which I think is really amazing - and I can't tell you where the break is, I'm sorry - but I do feel it will be incredibly dramatic, very moving and make people want to watch the next film."
A new teaser trailer featuring footage from both parts of Deathly Hallows was premiered at last week's MTV Movie Awards.
Harry Potter And The Deathly Hallows will open in cinemas this November.
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