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He didn't. He would walk out of Hogwarts grounds first, and then Dissaparate.

His dissapparition from Hogwarts only occured in the movie, and so can be considered non canon due to contradiction with the book.

And as he said in the movie "Being me has its privilages" .. implying that, as head master of Hogwarts, he an turn some of its defensive enchantments on and off at will.

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