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it means that if you are acting and you just don't remeber your line and you say something else that is breaking character
There is no such character called Rebecca in The Twilight Saga: Breaking Dawn, at all.
A fictional character in Breaking Bad.
It is considered breaking the fourth wall, but it must be done without breaking character, which is not the same thing.
In the acclaimed Twilight saga novel Breaking Dawn, the character Huilen's nephew is Nahuel.